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content shows off while scrolling in responsive hambuger responsive

I was finishing up creating this page using html and css after finishing up i was just checking the navigation menu in a mobile view and while scrolling down the menu the content of the page shows off and menu goes down and the content shows off
I want content not be shown while scrolling or not scrolling in the hamburger menu
code:
#import url('https://fonts.googleapis.com/css2?family=Poppins:wght#300&display=swap');
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Poppins', sans-serif;
}
body {
background-color: #2f2f42;
}
nav {
display: flex;
height: 90px;
width: 100%;
align-items: center;
justify-content: space-between;
padding: 0 50px 0 100px;
flex-wrap: wrap;
}
nav .logo {
font-size: 20px;
font-weight: bold;
color: teal;
}
nav ul {
display: flex;
flex-wrap: wrap;
list-style: none;
}
nav ul li {
margin: 0 5px;
}
nav ul li a {
color: rgb(92, 156, 92);
text-decoration: none;
font-size: 18px;
font-weight: 500;
padding: 8px 15px;
border-radius: 5px;
letter-spacing: 1px;
transition: all 0.3s ease;
}
nav ul li a.active,
nav ul li a:hover {
color: teal;
background-color: white;
}
nav .menu-btn i {
color: #fff;
font-size: 22px;
cursor: pointer;
display: none;
}
input[type="checkbox"] {
display: none;
}
#media (max-width: 1000px) {
nav {
padding: 0 40px 0 50px;
}
}
#media (max-width: 920px) {
nav .menu-btn i {
display: block;
}
#click:checked~.menu-btn i:before {
content: "\f00d";
}
nav ul {
position: fixed;
top: 80px;
left: -100%;
z-index: 9999;
/** ADDED **/
height: 100vh;
width: 100%;
text-align: center;
display: block;
transition: all 0.3s ease;
background-color: #2f2f42;
/** ADDED **/
}
#click:checked~ul {
left: 0;
}
nav ul li {
width: 100%;
margin: 40px 0;
}
nav ul li a {
width: 100%;
margin-left: -100%;
display: block;
font-size: 20px;
transition: 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
#click:checked~ul li a {
margin-left: 0px;
}
nav ul li a.active,
nav ul li a:hover {
background: none;
color: teal;
}
}
.content {
position: relative;
background-color: #131314;
color: whitesmoke;
border: 5px solid grey;
border-radius: 12px;
width: auto;
height: 50rem;
margin-top: 1vw;
margin-left: 4vw;
margin-right: 4vw;
font-weight: bolder;
}
#media (max-width: 920px) {
.content {
display: block;
}
}
#media (max-width: 920px) {
.content #bor,
.det,
.clk {
display: block;
}
}
.bor {
justify-content: center;
text-align: center;
border-bottom: 0.7vw solid white;
}
.det {
display: inline-block;
margin-left: 1vw;
text-align: left;
border-bottom: 0.6vw solid whitesmoke;
}
.clk {
float: right;
width: fit-content;
height: fit-content;
margin-right: 1vw;
}
h2 {
box-sizing: border-box;
padding: 0.6vw;
margin: 0.8vw 0.8vw 0.8vw 0.8vw;
background-color: rgb(64, 80, 113);
text-align: left
}
#exp {
padding: 0.8vw;
margin: 0.8vw 0.8vw 0.8vw 1.9vw;
text-align: left;
}
footer {
background-color: rgb(104, 99, 25);
color: black;
margin: 15px;
padding: 15px;
border-radius: 8px;
}
#foo {
text-align: center;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.0/css/all.min.css" rel="stylesheet" />
<nav>
<div class="logo">Logo img</div>
<input type="checkbox" id="click">
<label for="click" class="menu-btn">
<i class="fas fa-bars"></i>
</label>
<ul>
<li><a class="active" href="#">Home</a></li>
<li>Services</li>
<li>About</li>
</ul>
</nav>
<div class="content">
<p class="bor"> this is content heading <br>
</p><br>
<span class="det">this is content side</span> <button class="clk">Watch</button><br><br>
<span class="det">this is content side</span><button class="clk">Watch</button><br><br><br>
<h2>this is demo</h2>
<p id="exp">this is content end</p>
</div>
<div id="foo">
<footer>
<p>Copyright © company 2022<br><br> All Rights Reserved</p>
</footer>
</div>

You could use JS to disable scroll when the menu shows up and enable when it's closed. Although, I don't understand why you wanted to use checkbox input for closing the menu. you could handle scrollbar like this
HTML
<label for="click" class="menu-btn" onclick={disableScroll()}>
<i class="fas fa-bars"></i>
</label>
<label for="click" class="close-btn" onclick={enableScroll()}>
<i class="fa-solid fa-xmark"></i>
</label>
Javascript
<script>
const disableScroll = () =>{
document.body.style.height = "100%";
document.body.style.overflow = "hidden";
document.querySelector("menu-btn").style.display = "none"
document.querySelector("close-btn").style.display = "block"
}
const enableScroll = () =>{
document.body.style.overflow = "auto";
document.querySelector("menu-btn").style.display = "block"
document.querySelector("close-btn").style.display = "none"
}
</script>

Collapsable Nav Bar using just JavaScript

I am trying to build a mobile view navigation bar that closes after clicking on a list item and I'm having trouble finding a solution. The requirements state not to use jQuery or CSS. Although, CSS solutions are also helpful. The aim is to have the list items navigate the user to a section on the page with the appropriate id. It works as it should but I want the mobile view nav bar to close after clicking a list item. Here is my code so far:
const toggleButton = document.getElementsByClassName('toggle-button')[0]
const navbarLinks = document.getElementsByClassName('navbar-links')[0]
toggleButton.addEventListener('click', () => {
navbarLinks.classList.toggle('active')
})
.navbar {
display: flex;
position: fixed;
width: 100%;
justify-content: space-between;
align-items: center;
background-color: #2a324b;
color: white;
top: 0;
}
.brand-title {
font-size: 1.5rem;
margin: .5rem;
}
.navbar-links {
height: 100%;
}
.navbar-links ul {
display: flex;
margin: 0;
padding: 0;
}
.navbar-links li {
list-style: none;
}
.navbar-links li a {
display: block;
text-decoration: none;
color: white;
padding: 1rem;
}
.navbar-links li:hover {
background-color: rgb(204, 194, 194);
color: #2a324b;
}
.toggle-button {
position: absolute;
top: .75rem;
right: 1rem;
display: none;
flex-direction: column;
justify-content: space-between;
width: 30px;
height: 21px;
}
.toggle-button .bar {
height: 3px;
width: 100%;
background-color: white;
border-radius: 10px;
}
#media (max-width: 800px) {
.navbar {
flex-direction: column;
align-items: flex-start;
}
.toggle-button {
display: flex;
}
.navbar-links {
display: none;
width: 100%;
}
.navbar-links ul {
width: 100%;
flex-direction: column;
}
.navbar-links ul li {
text-align: center;
}
.navbar-links ul li a {
padding: .5rem 1rem;
}
.navbar-links.active {
display: flex;
}
}
<nav class="navbar">
<div class="brand-title">Palesa Mapeka</div>
<a href="#" class="toggle-button">
<span class="bar"></span>
<span class="bar"></span>
<span class="bar"></span>
</a>
<div class="navbar-links">
<ul>
<li>About Me</li>
<li>Tech Stack</li>
<li>Projects</li>
</ul>
</div>
</nav>
Ideas on how to solve my dilemma are appreciated. I want to learn how to do this using JavaScript.

Why not just add the same click listener to the navbar-links class?
const toggleButton = document.getElementsByClassName('toggle-button')[0]
const navbarLinks = document.getElementsByClassName('navbar-links')[0]
toggleButton.addEventListener('click', () => {
navbarLinks.classList.toggle('active')
})
navbarLinks.addEventListener('click', () => {
navbarLinks.classList.toggle('active')
})
.navbar {
display: flex;
position: fixed;
width: 100%;
justify-content: space-between;
align-items: center;
background-color: #2a324b;
color: white;
top: 0;
}
.brand-title {
font-size: 1.5rem;
margin: .5rem;
}
.navbar-links {
height: 100%;
}
.navbar-links ul {
display: flex;
margin: 0;
padding: 0;
}
.navbar-links li {
list-style: none;
}
.navbar-links li a {
display: block;
text-decoration: none;
color: white;
padding: 1rem;
}
.navbar-links li:hover {
background-color: rgb(204, 194, 194);
color: #2a324b;
}
.toggle-button {
position: absolute;
top: .75rem;
right: 1rem;
display: none;
flex-direction: column;
justify-content: space-between;
width: 30px;
height: 21px;
}
.toggle-button .bar {
height: 3px;
width: 100%;
background-color: white;
border-radius: 10px;
}
#media (max-width: 800px) {
.navbar {
flex-direction: column;
align-items: flex-start;
}
.toggle-button {
display: flex;
}
.navbar-links {
display: none;
width: 100%;
}
.navbar-links ul {
width: 100%;
flex-direction: column;
}
.navbar-links ul li {
text-align: center;
}
.navbar-links ul li a {
padding: .5rem 1rem;
}
.navbar-links.active {
display: flex;
}
}
<nav class="navbar">
<div class="brand-title">Palesa Mapeka</div>
<a href="#" class="toggle-button">
<span class="bar"></span>
<span class="bar"></span>
<span class="bar"></span>
</a>
<div class="navbar-links">
<ul>
<li>About Me</li>
<li>Tech Stack</li>
<li>Projects</li>
</ul>
</div>
</nav>

I think we should to try this
<button type="button"
onclick="document.getElementByClassName('navbar').style.display = 'none'">
Hide Navbar</button>
It will hide any element with navbar className
Thank you

Responsive center navbar

My goal is to make a navbar which is centered in the web page and responsive like here on stack.
So far I managed with some research and tutorials make a navbar which is responsive but it spreads to the end of corners.
I tried to wrap it in a container like I do with content but it limited whole navbar to middle.
Then tried to add margin to left and right but when I got on smaller screens it became ugly.
So I want your opinions how to fix it or if there is some other preferred way to do navbars.
const toggleButton = document.getElementsByClassName('toggle-button')[0]
const navbarLinks = document.getElementsByClassName('navbar-links')[0]
toggleButton.addEventListener('click', () => {
navbarLinks.classList.toggle('active')
})
* {
box-sizing: border-box;
}
body {
margin: 0;
padding: 0;
}
.navbar {
display: flex;
position: relative;
justify-content: space-between;
align-items: center;
background-color: #333;
color: white;
}
.brand-title {
font-size: 1.5rem;
margin: .5rem;
}
.navbar-links {
height: 100%;
}
.navbar-links ul {
display: flex;
margin: 0;
padding: 0;
}
.navbar-links li {
list-style: none;
}
.navbar-links li a {
display: block;
text-decoration: none;
color: white;
padding: 1rem;
}
.navbar-links li:hover {
background-color: #555;
}
.toggle-button {
position: absolute;
top: .75rem;
right: 1rem;
display: none;
flex-direction: column;
justify-content: space-between;
width: 30px;
height: 21px;
}
.toggle-button .bar {
height: 3px;
width: 100%;
background-color: white;
border-radius: 10px;
}
#media (max-width: 800px) {
.navbar {
flex-direction: column;
align-items: flex-start;
}
.toggle-button {
display: flex;
}
.navbar-links {
display: none;
width: 100%;
}
.navbar-links ul {
width: 100%;
flex-direction: column;
}
.navbar-links ul li {
text-align: center;
}
.navbar-links ul li a {
padding: .5rem 1rem;
}
.navbar-links.active {
display: flex;
}
}
<nav class="navbar">
<div class="brand-title">Fruit Basket</div>
<a href="#" class="toggle-button">
<span class="bar"></span>
<span class="bar"></span>
<span class="bar"></span>
</a>
<div class="navbar-links">
<ul>
<li>Home</li>
<li>About</li>
<li>Contact</li>
</ul>
</div>
</nav>

Wrap the entire thing in a header, set max-width: 800px; margin: 0 auto; on the nav and move the background-color to header:
const toggleButton = document.getElementsByClassName('toggle-button')[0]
const navbarLinks = document.getElementsByClassName('navbar-links')[0]
toggleButton.addEventListener('click', () => {
navbarLinks.classList.toggle('active')
})
* {
box-sizing: border-box;
}
body {
margin: 0;
padding: 0;
}
header {
background-color: #333;
}
.navbar {
display: flex;
position: relative;
justify-content: space-between;
align-items: center;
margin: 0 auto;
max-width: 800px;
color: white;
}
.brand-title {
font-size: 1.5rem;
margin: .5rem;
}
.navbar-links {
height: 100%;
}
.navbar-links ul {
display: flex;
margin: 0;
padding: 0;
}
.navbar-links li {
list-style: none;
}
.navbar-links li a {
display: block;
text-decoration: none;
color: white;
padding: 1rem;
}
.navbar-links li:hover {
background-color: #555;
}
.toggle-button {
position: absolute;
top: .75rem;
right: 1rem;
display: none;
flex-direction: column;
justify-content: space-between;
width: 30px;
height: 21px;
}
.toggle-button .bar {
height: 3px;
width: 100%;
background-color: white;
border-radius: 10px;
}
#media (max-width: 800px) {
.navbar {
flex-direction: column;
align-items: flex-start;
}
.toggle-button {
display: flex;
}
.navbar-links {
display: none;
width: 100%;
}
.navbar-links ul {
width: 100%;
flex-direction: column;
}
.navbar-links ul li {
text-align: center;
}
.navbar-links ul li a {
padding: .5rem 1rem;
}
.navbar-links.active {
display: flex;
}
}
<header>
<nav class="navbar">
<div class="brand-title">Fruit Basket</div>
<a href="#" class="toggle-button">
<span class="bar"></span>
<span class="bar"></span>
<span class="bar"></span>
</a>
<div class="navbar-links">
<ul>
<li>Home</li>
<li>About</li>
<li>Contact</li>
</ul>
</div>
</nav>
</header>
margin: 0 auto centers the nav and max-width caps how wide it can be. If you want it to be wider just change this property.

As per your comment:
"I want what I have now, but with a change that when its on big screen that "logo" and links are on center like for example here on stackoverflow. When I did that with padding or container it messed with smaller screens view. – Angelll"
What I understood is you need everything center in bigger screen.
Correct me If I am wrong.
As per my understanding I have found the solution and added in the below code snippet.
I have replaced the .navbar class justify-content property to center.
const toggleButton = document.getElementsByClassName('toggle-button')[0]
const navbarLinks = document.getElementsByClassName('navbar-links')[0]
toggleButton.addEventListener('click', () => {
navbarLinks.classList.toggle('active')
})
* {
box-sizing: border-box;
}
body {
margin: 0;
padding: 0;
}
.navbar {
display: flex;
position: relative;
justify-content: center;
align-items: center;
background-color: #333;
color: white;
}
.brand-title {
font-size: 1.5rem;
margin: .5rem;
}
.navbar-links {
height: 100%;
}
.navbar-links ul {
display: flex;
margin: 0;
padding: 0;
}
.navbar-links li {
list-style: none;
}
.navbar-links li a {
display: block;
text-decoration: none;
color: white;
padding: 1rem;
}
.navbar-links li:hover {
background-color: #555;
}
.toggle-button {
position: absolute;
top: .75rem;
right: 1rem;
display: none;
flex-direction: column;
justify-content: space-between;
width: 30px;
height: 21px;
}
.toggle-button .bar {
height: 3px;
width: 100%;
background-color: white;
border-radius: 10px;
}
#media (max-width: 800px) {
.navbar {
flex-direction: column;
align-items: flex-start;
}
.toggle-button {
display: flex;
}
.navbar-links {
display: none;
width: 100%;
}
.navbar-links ul {
width: 100%;
flex-direction: column;
}
.navbar-links ul li {
text-align: center;
}
.navbar-links ul li a {
padding: .5rem 1rem;
}
.navbar-links.active {
display: flex;
}
}
<nav class="navbar">
<div class="brand-title">Fruit Basket</div>
<a href="#" class="toggle-button">
<span class="bar"></span>
<span class="bar"></span>
<span class="bar"></span>
</a>
<div class="navbar-links">
<ul>
<li>Home</li>
<li>About</li>
<li>Contact</li>
</ul>
</div>
</nav>

Collapse mobile header when somewhere else on the page is clicked

I'm currently working with a really basic header (I eventually want it to animate when opening and collapsing and have the hamburger menu animate to/from the close icon). The header is responsive and the user can collapse it when tapping the close icon. How can I make it collapse whenever somewhere other than the header is tapped:
Here's what I'm working with so far.
body,
html {
max-width: 100%;
padding: 0vw;
margin: 0vw;
}
.header {
background-color: #ffffff;
position: fixed;
top: 0%;
left: 0%;
right: 0%;
height: 10vh;
z-index: 1;
border-bottom: solid;
display: flex;
justify-content: space-between;
}
.headerfill {
height: 10vh;
border: none;
}
.header-container {
width: 100%;
height: auto;
display: flex;
flex-flow: row nowrap;
justify-content: center;
margin: auto;
margin-left: auto;
margin-right: auto;
}
.logo-container {
float: left;
width: 40%;
padding-left: 1vh;
display: flex;
flex-flow: row nowrap;
justify-content: left;
}
.navigation-container {
width: 60%;
display: flex;
flex-flow: row nowrap;
//justify-content: space-evenly;
margin: auto;
margin-left: auto;
margin-right: auto;
text-align: center;
}
.space-evenly {
justify-content: space-evenly;
}
#media only screen and (max-width: 500px) {
.logo-container {
float: left;
width: 80%;
padding-left: 1vh;
display: flex;
flex-flow: row nowrap;
justify-content: left;
}
}
#media only screen and (max-width: 500px) {
.navigation-container {
width: 20%;
display: flex;
flex-flow: row nowrap;
//justify-content: space-evenly;
margin: auto;
margin-left: auto;
margin-right: auto;
text-align: center;
}
.space-evenly {
justify-content: space-evenly;
}
}
.logo {
height: 8vh;
max-width: 40%;
padding-top: 1.5vh;
padding-bottom: 0.5vh;
padding-left: 4vh;
display: block;
object-fit: contain;
}
#media only screen and (max-width: 500px) {
.logo {
height: 8vh;
max-width: 80%;
padding-top: 1.5vh;
padding-bottom: 0.5vh;
padding-left: 2vh;
display: block;
object-fit: contain;
}
}
img {
-webkit-user-drag: none;
}
.nav {
font-family: 'Roboto', serif;
font-size: 2vw;
text-align: center;
margin-top: auto;
margin-bottom: auto;
color: #000000;
padding-left: auto;
padding-right: auto;
line-height: 1em;
object-fit: contain;
text-decoration: none;
}
#media only screen and (max-width: 500px) {
.nav {
font-family: 'Roboto', serif;
font-size: 8vw;
text-align: left;
margin-top: 2vh;
margin-bottom: auto;
color: #000000;
padding-left: 2vh;
padding-right: 2vh;
line-height: 1em;
object-fit: contain;
text-decoration: none;
}
}
.nav:hover {
color: #096e67;
}
a:link {
color: #000000;
text-decoration: none;
}
h1 {
font-family: 'Roboto', serif;
font-size: 4vw;
text-align: left;
margin-top: 0px;
margin-bottom: 0px;
color: #000000;
padding-left: 4vh;
padding-right: 2vh;
padding-bottom: 0.5vh;
line-height: 1em;
}
#media only screen and (max-width: 500px) {
h1 {
font-family: 'Roboto', serif;
font-size: 8vw;
text-align: left;
margin-top: 0px;
margin-bottom: 0px;
color: #000000;
padding-left: 2vh;
padding-right: 2vh;
padding-bottom: 0.5vh;
line-height: 1em;
}
}
nav {
display: flex;
width: 100%;
justify-content: space-evenly;
margin-right: auto;
text-align: right;
}
nav a {
display: block;
}
i {
display: none !important;
}
#media (max-width: 500px) {
nav {
position: absolute;
top: 100%;
left: 0;
right: 0;
display: none;
}
nav.active {
display: block;
background-color: aqua;
border-top: solid;
border-bottom: green solid 0.2vh;
padding: 1vh;
padding-bottom: 2vh;
}
i {
display: block!important;
margin: 5px;
}
}
.fa {
font-size: 6vh;
padding-top: 2vh;
padding-bottom: 2vh;
padding: 0vh;
}
<html lang="en-GB">
<head>
<meta charset="utf-8" />
<title>Website Header</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="./stylesheet.css">
</head>
<body>
<header>
<div class="header">
<div class="header-container">
<div class="logo-container">
<img class="logo" src="https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png" alt="Logo">
</div>
<div class="navigation-container space-evenly">
<nav>
<a href="#">
<p class="nav">Page1</p>
</a>
<a href="#">
<p class="nav">Page2</p>
</a>
<a href="#">
<p class="nav">Page3</p>
</a>
<a href="#">
<p class="nav">Page4</p>
</a>
</nav>
<i class="fa fa-bars"></i>
</div>
</div>
</div>
</header>
<script>
menu = document.querySelector('nav');
document.querySelector('i')
.addEventListener('click', e => {
menu.classList.toggle('active')
document.querySelector('header i').classList.toggle('fa-bars')
document.querySelector('header i').classList.toggle('fa-times')
})
</script>
<div class="header-fill">
</div>
There's quite a lot. I'd just like it so if the user decides to tap somewhere else they don't have to click the close button in case they decide to stick with that page.
Bonus if someone can figure out how to add bootstrap for expansion and collapse of the header (in mobile view) and to animate the close/hamburger menu.
Quite stuck,
Thanks in advance.

try this
$(document).click(function() {
$("nav").removeClass("active")
})
$("nav").click(function(e) {
e.stopPropagation()
return false
})
$(".fa.fa-bars").click(function(e) {
e.stopPropagation()
$("nav").toggleClass("active")
})

This should solve you problem let me know the outcome
let button =document.querySelector('body').addEventListener('click', buttonClick);
function buttonClick(e)
{
//to view current target on console
console.log(e.target);
//checks if you've clicked out side the nav
if(!e.target.classList.contains('navigation-container'))
{
//checks if nav is open
if(document.querySelector('nav').classList.contains('active'))
{
console.log('now closing nav');
//from your code this should close the nav but adjust to close the nav if this dose not work
menu.classList.toggle('active')
document.querySelector('header i').classList.toggle('fa-bars')
document.querySelector('header i').classList.toggle('fa-times')
}
}
}

Make dropdown menu in css like in the picture

I have questions about how to reproduce the following:
I have the menu like this:
body {
background: white;
margin: 0;
padding: 0;
}
/*
/ nav
*/
nav {
width: 100%;
background: #000;
border-bottom: 5px solid white;
position: relative;
font-family: 'Decker';
}
nav:after {
content: '';
height: 8px;
width: 100%;
background: inherit;
position: absolute;
bottom: -15px;
left: 0px;
z-index: 1;
}
nav ul {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
max-width: 100%;
margin: auto;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
padding-bottom: .6em;
}
nav li {
display: inline-block;
list-style: none;
position: relative;
padding: 0 .5em;
}
nav li:last-child a:before {
display: none;
}
nav li a {
color: #fff;
display: inline-block;
padding: 1.6em 0.6em 0.7em 0.6em;
text-decoration: none;
position: relative;
font-size: 18px;
line-height: 1;
}
nav li a:before {
content: "|";
display: block;
position: absolute;
right: -10px;
top: 1.6em;
-webkit-transform: translateY(-4%);
transform: translateY(-4%);
line-height: inherit;
font-size: inherit;
color: #fff;
}
nav li a:after {
display: none;
content: "";
position: absolute;
bottom: -25px;
left: 0px;
width: 100%;
height: 8px;
background: #fac312;
z-index: 2;
}
nav li a:hover {
background: #b42024;
color: #fff;
text-decoration: none;
}
nav li a.active {
background: #b42024;
color: #fff;
text-decoration: none;
}
nav li a.active:after {
display: block;
content: "";
position: absolute;
bottom: -25px;
left: 0px;
width: 100%;
height: 8px;
background: #fac312;
z-index: 2;
}
nav li a:hover:after {
display: block;
}
<nav>
<ul>
<li>
Home
</li>
<li>
About Us
</li>
<li>
Products
</li>
<li>
Contact
</li>
</ul>
</nav>
But, I don't know how to make the drop-down list like the picture shown above.
I hope someone can help me. Thank you in advance!

Hey This is what You want :) I hope
body {
background: white;
margin: 0;
padding: 0;
}
nav {
width: 100%;
background: #000;
border-bottom: 5px solid white;
position: relative;
}
nav:after {
content: '';
height: 8px;
width: 100%;
background: inherit;
position: absolute;
bottom: -15px;
left: 0px;
z-index: 1;
}
nav ul {
list-style-type: none;
margin: 0;
padding: 0;
}
nav a {
color: #fff;
text-decoration: none;
}
.nav__cat {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
max-width: 100%;
margin: auto;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
padding-bottom: .6em;
}
.nav__li {
display: inline-block;
list-style: none;
position: relative;
padding: 0 .5em;
}
.nav__li:last-child a:before {
display: none;
}
.nav__li:hover > a {
background: red;
}
.nav__li:hover > a:after {
display: block;
}
.nav__li:hover .sub__category {
visibility: visible;
opacity: 1;
}
.nav__li > a {
display: inline-block;
padding: 25.6px 0.6em 0.7em 0.6em;
position: relative;
font-size: 18px;
line-height: 1;
}
.nav__li > a:before {
content: "|";
display: block;
position: absolute;
right: -10px;
top: 25.6px;
-webkit-transform: translateY(-4%);
transform: translateY(-4%);
line-height: inherit;
font-size: inherit;
}
.nav__li > a:after {
display: none;
content: "";
position: absolute;
bottom: -25px;
left: 0px;
width: 100%;
height: 8px;
background: #ffaf1a;
z-index: 2;
}
.sub__category {
visibility: hidden;
opacity: 0;
}
.sub__category {
position: absolute;
top: 100%;
left: 0px;
min-width: 160px;
width: 100%;
z-index: 3;
margin: 0 .5em;
padding-top: 25.6px;
-webkit-transition: all .12s linear;
transition: all .12s linear;
}
.sub__li {
text-align: center;
border-bottom: 2px #000 solid;
background: red;
}
.sub__link {
padding: .7em 1em;
display: block;
font-size: 14px;
}
.sub__link:hover {
background: #fff;
color: #000;
}
<nav>
<ul class="nav__cat">
<li class="nav__li">Menu 1</li>
<li class="nav__li">Menu 23
<ul class="sub__category">
<li class="sub__li">
Subcategory
</li>
<li class="sub__li">
Subcategory 2
</li>
<li class="sub__li">
Subcategory 3
</li>
</ul>
</li>
<li class="nav__li">Menu 345
<ul class="sub__category">
<li class="sub__li">
Subcategory
</li>
<li class="sub__li">
Subcategory 2
</li>
<li class="sub__li">
Subcategory 3
</li>
</ul>
</li>
<li class="nav__li">Menu 4567</li>
<li class="nav__li">Menu 56789</li>
</ul>
</nav>

For starters, you obviously will need some content in each of the menus!
Make sure to open this in the full page.
There is still a lot more styling work that needs to be done to achieve the result you want, but hopefully this helps you get moving in the right direction.
body {
background: white;
margin: 0;
padding: 0;
}
/*
/ nav
*/
nav {
width: 100%;
background: #000;
border-bottom: 5px solid white;
position: relative;
font-family: 'Decker';
}
nav:after {
content: '';
height: 8px;
width: 100%;
background: inherit;
position: absolute;
bottom: -15px;
left: 0px;
z-index: 1;
}
nav .mainmenu {
/*display: -webkit-box;
display: -ms-flexbox;
display: flex;*/
text-align: center;
max-width: 100%;
margin: auto;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
padding-bottom: .6em;
}
nav .firstlevel {
display: inline-block;
list-style: none;
position: relative;
padding: 0 .5em;
}
nav .firstlevel:last-child a:before {
display: none;
}
nav .firstlevel a {
width: 120px;
color: #fff;
display: inline-block;
padding: 1.6em 0.6em 0.7em 0.6em;
text-decoration: none;
position: relative;
font-size: 18px;
line-height: 1;
}
nav .firstlevel a:before {
content: "|";
display: block;
position: absolute;
right: -10px;
top: 1.6em;
-webkit-transform: translateY(-4%);
transform: translateY(-4%);
line-height: inherit;
font-size: inherit;
color: #fff;
}
nav .firstlevel a:after {
display: none;
content: "";
position: absolute;
bottom: -25px;
left: 0px;
width: 100%;
height: 8px;
background: #fac312;
z-index: 2;
}
nav .firstlevel a:hover {
background: #b42024;
color: #fff;
text-decoration: none;
}
nav .firstlevel a.active {
background: #b42024;
color: #fff;
text-decoration: none;
}
nav .firstlevel a.active:after {
display: block;
content: "";
position: absolute;
bottom: -25px;
left: 0px;
width: 100%;
height: 8px;
background: #fac312;
z-index: 2;
}
nav .firstlevel a:hover:after {
display: block;
}
.firstlevel{
vertical-align: top;
}
.submenu_group{
display:none;
padding-left: 0px;
}
li{
list-style-type: none;
}
li .submenu{
display: block;
width: 120px;
}
.active:hover .submenu_group{
display: block;
}
<body>
<nav>
<ul class="mainmenu">
<li class='firstlevel active'>
Home
<ul class='submenu_group'>
<li>
<a class='submenu'>first item</a>
</li>
<li>
<a class='submenu'>second item</a>
</li>
<li>
<a class='submenu'>third item</a>
</li>
</ul>
</li>
<li class='firstlevel'>
<div>
About Us
</div>
</li>
<li class='firstlevel'>
<div>
Products
</div>
</li>
<li class='firstlevel'>
<div>
Contact
</div>
</li>
</ul>
</nav>
</body>

Here a fiddle of improved #Our_Benfactors answer
fiddle
body {
background: white;
margin: 0;
padding: 0;
}
/*
/ nav
*/
nav {
width: 100%;
background: #000;
border-bottom: 5px solid white;
position: relative;
font-family: 'Decker';
}
nav:after {
content: '';
height: 8px;
width: 100%;
background: inherit;
position: absolute;
bottom: -15px;
left: 0px;
z-index: 1;
}
nav .mainmenu {
/*display: -webkit-box;
display: -ms-flexbox;
display: flex;*/
text-align: center;
max-width: 100%;
margin: auto;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
padding-bottom: .6em;
}
nav .firstlevel {
display: inline-block;
list-style: none;
position: relative;
padding: 0 .5em;
}
nav .firstlevel:last-child a:before {
display: none;
}
nav .firstlevel a {
width: 120px;
color: #fff;
display: inline-block;
padding: 1.6em 0.6em 0.7em 0.6em;
text-decoration: none;
position: relative;
font-size: 18px;
line-height: 1;
}
nav .firstlevel a:before {
content: "|";
display: block;
position: absolute;
right: -10px;
top: 1.6em;
-webkit-transform: translateY(-4%);
transform: translateY(-4%);
line-height: inherit;
font-size: inherit;
color: #fff;
}
nav .firstlevel a:after {
display: none;
content: "";
position: absolute;
bottom: -25px;
left: 0px;
width: 100%;
height: 8px;
background: #fac312;
z-index: 2;
}
nav .firstlevel a:hover {
background: #b42024;
color: #fff;
text-decoration: none;
}
nav .firstlevel a.active {
background: #b42024;
color: #fff;
text-decoration: none;
}
nav .firstlevel a.active:after {
display: block;
content: "";
position: absolute;
bottom: -25px;
left: 0px;
width: 100%;
height: 8px;
background: #fac312;
z-index: 2;
}
.active .submenu_group a:after {
background: transparent;
}
.active .submenu_group a {
background:#b42024;
}
.active .submenu_group a:hover {
background: #fff;
color:#000;
border-top: 2px inset #000;
border-bottom: 2px inset #000;
}
.active .submenu_group li:first-child a:hover {
border-top: 0;
}
nav .firstlevel a:hover:after {
display: block;
}
.firstlevel{
vertical-align: top;
}
.submenu_group{
display:none;
padding-left: 0px;
}
.active .submenu_group li:first-child a {
margin-top: 28px;
}
.active .submenu_group a {
padding: 10px;
}
.active:hover .submenu_group {
display: block;
position: absolute;
background: #000;
}
li{
list-style-type: none;
}
li .submenu{
display: block;
width: 120px;
}
.active:hover .submenu_group{
display: block;
}
<body>
<nav>
<ul class="mainmenu">
<li class='firstlevel active'>
Home
<ul class='submenu_group'>
<li>
<a class='submenu'>first item</a>
</li>
<li>
<a class='submenu'>second item</a>
</li>
<li>
<a class='submenu'>third item</a>
</li>
</ul>
</li>
<li class='firstlevel'>
<div>
About Us
</div>
</li>
<li class='firstlevel'>
<div>
Products
</div>
</li>
<li class='firstlevel'>
<div>
Contact
</div>
</li>
</ul>
</nav>
</body>