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How to create a responsive popup subscribe modal

I am trying to create a subscribe popup for the user to click on the subscribe button and to receive notification.
Does anyone know how to make this popup become responsive? Need this for my assignment. The button and the popup container are required to responsive. I have tried width:100% in #media but the width of the button will become too long. The notification part i have done.
How can I fix this? Please provide some solutions. Thank you
function subOpen() {
document.getElementById("sub").style.display = "block";
}
function subClose() {
document.getElementById("sub").style.display = "none";
}
.subscribe{
box-sizing: border-box;
}
.open-button {
background-color:cornflowerblue;
color: black;
font-weight: bold;
padding: 16px 15px;
border: none;
cursor: pointer;
opacity: 0.8;
width: 15%;
border-radius: 5px;
}
.sub-title{
margin-top: 30px;
margin-bottom: 20px;
font-weight: bold;
text-align: center;
}
.sub-p{
text-align: center;
font-size: 1;
}
/* The popup form - hidden by default */
.sub-popup {
display: none;
position: fixed;
bottom:100px;
left:500px;
border: none;
border-radius:5px;
z-index: 9;
}
#sub {
max-width: 300px;
padding: 10px;
background-color:beige;
}
/* Set a style for the subscribe button */
#sub .btn {
background-color: #04AA6D;
color: white;
padding: 16px 20px;
border: none;
cursor: pointer;
width:50%;
margin-bottom:10px;
margin-left: 70px;
opacity: 0.8;
}
#sub .cancel {
background-color: red;
}
#sub .btn:hover, .open-button:hover {
opacity: 1;
}
<div class= "subscribe">
<button class="open-button" onclick="subOpen()">SUBSCRIBE</button>
<div class="sub-popup" id="sub">
<h4 class="sub-title container">SUBSCRIBE US</h4>
<p class="sub-p">Click to receive notification to get our updates and special offers now!</p>
<button type="submit" class="btn subscribeBtn">Subscribe</button>
<button type="button" class="btn cancel" onclick="subClose()">Close</button>
</div>
</div>

Try this:
.subscribe {
box-sizing: border-box;
position: relative;
}
.sub-popup {
display: none;
position: absolute;
top: 50%;
left: 50%;
border: none;
border-radius: 5px;
z-index: 9;
transform: translate(-50%, 50%);
}

The answer to this question depends on what you mean by 'make it become responsive', and how you want it to respond.
In general, using units such as vw, vh, and % create sizes that are responsive to your window size.
Media queries can be used if you want styling to change at certain dimensions.
Place this at the end of your CSS, and your popup window will align to the left when your window is 600px or less.
#media (max-width: 600px){
.sub-popup{
left: 0px;
}

The left and bottom using px positioning on the popup form were messing up the responsiveness, first fix that came up to my mind was replacing them with margin 0 auto which basically centers it within it's parent container.
If you're using an absolute unit (px), you need to set media queries to match different screen sizes and change the values accordingly.
I'm not trying to say that using px for sizing is bad, it really depends on what are you trying to achieve so getting familiar with the different units really comes in handy.
There are actually quite a few solutions for this including flexbox, bootstrap, media queries, using relative units.
Hopefully these good reads can help you.
W3 CSS Units
What’s The Difference Between PX, EM, REM, %, VW, and VH?
function subOpen() {
document.getElementById("sub").style.display = "block";
}
function subClose() {
document.getElementById("sub").style.display = "none";
}
.subscribe{
box-sizing: border-box;
}
.open-button {
background-color:cornflowerblue;
color: black;
font-weight: bold;
padding: 16px 15px;
border: none;
cursor: pointer;
opacity: 0.8;
width: 15%;
border-radius: 5px;
}
.sub-title{
margin-top: 30px;
margin-bottom: 20px;
font-weight: bold;
text-align: center;
}
.sub-p{
text-align: center;
font-size: 1;
}
/* The popup form - hidden by default */
.sub-popup {
display: none;
position: fixed;
margin: 0 auto; // replaced left and bottom positioning with margin 0 auto
border: none;
border-radius:5px;
z-index: 9;
}
#sub {
max-width: 300px;
padding: 10px;
background-color:beige;
}
/* Set a style for the subscribe button */
#sub .btn {
background-color: #04AA6D;
color: white;
padding: 16px 20px;
border: none;
cursor: pointer;
width:50%;
margin-bottom:10px;
margin-left: 70px;
opacity: 0.8;
}
#sub .cancel {
background-color: red;
}
#sub .btn:hover, .open-button:hover {
opacity: 1;
}
<div class= "subscribe">
<button class="open-button" onclick="subOpen()">SUBSCRIBE</button>
<div class="sub-popup" id="sub">
<h4 class="sub-title container">SUBSCRIBE US</h4>
<p class="sub-p">Click to receive notification to get our updates and special offers now!</p>
<button type="submit" class="btn subscribeBtn">Subscribe</button>
<button type="button" class="btn cancel" onclick="subClose()">Close</button>
</div>
</div>

Radio Button Unresponsive on some iOS devices

I'm encountering a problem where radio buttons work inconsistently.
The buttons only respond on some touch devices (iPhone & iPad) when the right side of the outer element is touched.
Desktop works fine.
If the user touches the radio button directly the button doesn't respond.
The weird thing is this doesn't happen on all touch devices. Some will work fine while others won't.
I tested on iPhone X and it works fine but iPhone 11 and iPad don't.
It works on mobile Chrome but not Safari and Firefox.
I've included the js, HTML, and css of one radio button below.
Thanks for you any help.
Js
document.querySelector("#s89fdf874ee_services > li:nth-child(1) > div > label")
HTML
<label><div class="icheckbox_square-blue checked"><input type="checkbox" id="s89fdf874ee_services_0" name="s89fdf874ee[services][]" value="2" checked="checked" style="position: absolute; visibility: hidden;"><ins class="iCheck-helper" style="position: absolute; top: 0%; left: 0%; display: block; width: 100%; height: 100%; margin: 0px; padding: 0px; background: rgb(255, 255, 255); border: 0px; opacity: 0;"></ins></div><span class="control-label__text">
Buyback</span></label>
CSS
-webkit-text-size-adjust: 100%;
-webkit-tap-highlight-color: rgba(0,0,0,0);
--zd_bold: LatoBold,var(--zd_fallback_font);
--zd_heavy: LatoHeavy,var(--zd_fallback_font);
--zd_fallback_font: -apple-system,system-ui,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
--zd_regular: LatoRegular,var(--zd_fallback_font);
--zd_semibold: LatoSemibold,var(--zd_fallback_font);
font-size: 14px;
line-height: 1.42857143;
color: #333;
font-family: 'Source Sans Pro','Helvetica Neue',Helvetica,Arial,sans-serif;
list-style: none;
box-sizing: border-box;
display: inline-block;
max-width: 100%;
min-height: 20px;
padding-left: 20px;
margin-bottom: 0;
cursor: pointer;
font-weight: 700;
margin-left: -20px;

Issues with responsive mobile menu

How do I make this work? I keep fiddling around with the codes but I get no luck. I'm trying to make a responsive mobile menu. I tried searching google and can't find any solution. Thanks
<div class="sidenav" id="sidenav">
<a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×
</a>
Home
Order
About
</div>
<div class="main_header">
<div class="main_nav">
<span onlick="openNav()">&#9776</span>
</div>
<h1>Treat your tastebuds</h1>
Order a coffee
</div>
<script type="text/javascript">
function openNav() {
document.getElementById("main_nav").style.width = "100%";
}
function closeNav(){
document.getElementById("closeNav").style.width="0";
}
</script>
Here is the CSS
.sidenav{
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: white;
overflow-x: hidden;
transition:0.5s;
}
sidenav a{
color: white;
text-decoration: none;
display: block;
transition: 0.3s;
font-size: 16px;
font-weight: 100;
text-align: center;
padding: 1em 0;
}
.main_header{
background-image: url(coffee1.jpg);
background-position: center;
background-size: cover;
background-repeat: no-repeat;
text-align: left;
color: white;
width: 100%;
height: 750px;
}
.main_header h1{
font-size: 36px;
font-weight: 900;
margin-left: 2em;
margin-top: 8em;
}
.btn_one{
margin-left: 11em;
color: white;
background-color: darkslategray;
text-decoration: none;
padding: 1em 2.5em;
}
.main_nav{
height: 40px;
}
.main_nav span{
color: white;
font-size: 30px;
text-decoration: none;
line-height: 40px;
margin-left: 0.25em;
float: left;
cursor: pointer;
}

Utilizing the bootstrap framework is an option.
Here is an example that provides a side navigation.
https://blackrockdigital.github.io/startbootstrap-simple-sidebar/

You have various typos in your code as well as undefined elements that you're attempting to manipulate.
Firstly, you have:<span onlick="openNav()">&#9776</span> which contains a typo. It's 'onclick', not 'onlick'.
Next, you're attempting to manipulate an element "main_nav", but in your HTML and CSS, you defined main_nav as a class (using a period). So, if you change your html to <div class="main_nav"> your issue for that will be fixed.
I'm unsure what your final menu design will be, but those changes will fix the problems you're running into.

Popup not showing once per session as wanted (as mentioned by client)

I'm trying to get a popup to show on load once per session. I'm seeing it okay from my end but my client is saying that he's not seeing it after the first time even after restarting his browser and clearing the cache.
Is there something I should change with the code below? Also, I'm unable to click the close button on mobile with touch. How can I make #popup-close respond to touch?
HTML
<div id="popup-wrap">
<div id="popup">
<div id="popup-close">×</div>
<a href="http://google.com/" target="_blank">
<img src="image.jpg" width="100">
</a>
<h2>We are featured this month in Architectural Digest!</h2>
Read the article »
</div>
</div>
JS
if (localStorage.getItem('popState') != 'shown'){
$("#popup-wrap").delay(2000).fadeIn();
localStorage.setItem('popState','shown')
}
$('#popup-close').click(function(e) {
e.preventDefault();
$('#popup-wrap').fadeOut(); // Now the pop up is hidden.
});
CSS
#popup-wrap {
background: #fff;
box-shadow: 1px 0 3px #999;
display: none;
font-family: 'montserrat', sans-serif;
height: 210px;
left: 50%;
margin-left: -250px;
margin-top: -105px;
opacity: .8;
position: absolute;
text-transform: uppercase;
top: 50%;
width: 500px;
z-index: 11;
}
#popup {
padding: 40px;
position: absolute;
}
#popup-close {
cursor: pointer;
font-size: 36px;
position: absolute;
right: 10px;
top: 0;
}
#popup img {
float: left;
margin-right: 20px;
}
#popup h2 {
color: #222;
font-size: 20px;
margin-bottom: .5em;
}
#popup a {
font-size: 12px;
text-decoration: none;
}
http://jsfiddle.net/23gu3L0h/

You may try to change localStorage to sessionStorage like I have done
In this Fiddle.
localStorage is meant for longterm use where as sessionStorage is more shortterm. Here is another post with some answers explaining them further.
It shows up once until you either clear your cache or restart your browser.
Also the I was able to close the pop-up from my phone in the fiddle.
Hope this helps.

fixed header jumps after scrolling down the page

I have found a few questions similar to this, but were unable to help me.
When I scroll down the page the header/navigation bar doesn't move "smoothly" with the page. After I reach a certain amount down the page, the header "jumps", but after that it's fine.
I have the following code for a fixed header:
$(window).scroll(function(){
if ($(window).scrollTop() >= 147) {
$("#top_nav").addClass("fixed");
$("#top_nav").css("position", "fixed");
$("#top_rule").hide();
$("#bottom_rule").hide();
}
else {
$("#top_nav").removeClass("fixed");
$("#top_nav").css("position", "initial");
$("#top_rule").show();
$("#bottom_rule").show();
}
});
My CSS:
.fixed {
width: 100%;
background: white;
border-bottom: 1px solid black;
box-shadow: 0 0 20px #000000;
top: 0px;
padding-top: 15px;
padding: 10px;
}
I don't have a position: fixed in my CSS, because for some reason it isn't working, so instead I used jQuery to set the position to fixed.
I have posted the rest of my page on jsfiddle.net
http://jsfiddle.net/5n4pF/
If I did not explain propelry, please ask and I'll try and explain better :)
Thanks in advance
EDIT
When I reach 147px, it must not jump. It looks as if it "hides and shows". Instead it must move smoothly as you scroll down the page.

You should position your header absolute. and give the news a margin-top the size of the header.
The reason why your position: fixed wasn't working is because you fixed it inside of a relative element. It get's fixed inside of that element (which isn't what you want, because you want it fixed on top of the page).
It jumps because of the fact that you change the element from static to fixed. All of a sudden you miss about 53 pixels of height in your layout . Which makes it jump.
In this fiddle: http://jsfiddle.net/5n4pF/3/
* {
margin: 0px;
padding: 0px;
}
header {
position: absolute;
top: 0;
left: 0;
width: 100%;
text-align: center;
}
#black_top {
background: black;
font-size: 5px;
display:block;
width: 100%;
height: 5px;
}
#logo_header {
margin-top: 20px;
}
.list_item {
list-style-type: none;
display: inline-block;
font: 16px Arial;
padding: 10px 30px 10px 30px;
text-align: center;
}
#top_nav {
font: Arial 30px;
display: block;
width: 100%;
}
.nav_links {
text-decoration: none;
color: black;
}
hr {
margin-right: 30px;
margin-left: 30px;
color: #f00;
opacity: 0.3;
}
.nav_bullets {
color: #D6D6D6;
}
::-moz-selection {
background: #93E6E5;
}
::selection {
background: #b3d4fc;
}
#news_block {
/*Chrome & Safari*/
-webkit-column-count: 3;
-webkit-column-gap: 40px;
/*Firefox*/
-moz-column-count:3;
-moz-column-gap: 40px;
margin: 20px;
position: absolute;
top: 249px;
width: 100%;
box-sizing: border-box;
}
#search_field {
font-size: 25px;
}
.fixed {
width: 100%;
box-sizing: border-box;
background: white;
border-bottom: 1px solid black;
box-shadow: 0 0 20px #000000;
top: 0;
position: fixed;
padding-top: 15px;
padding: 10px;
}
the correct code is given. It's still a bit buggy with widths of something. But the code in general is not very tidy. So I'll leave that part to you. Hope this works for you.

I was working on it today, and I found the solution.
Change the CSS from
.fixed-header .main-header {
display: none;
}
to
.fixed-header .main-header {
display: inline;
}