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DOM Manipulation modal window error with open button

I am learning JavaScript and have tried to make a modal window open when a button is pressed. I'm using an event listener, but I keep getting an error saying that this block of code is undefined: btnOpenModal.addEventListner('click', openModal);
Any help is most appreciated. Thank you in advance.
const modal = document.querySelector('.modal');
const overlay = document.querySelector('.overlay');
const btnCloseModal = document.querySelector('.close-modal');
const btnOpenModal = document.querySelector('.show-modal');
const openModal = function () {
// console.log('Button clicked');
modal.classList.remove('hidden');
overlay.classList.remove('hidden');
};
const closeModal = function () {
modal.classList.add('hidden');
overlay.classList.add('hidden');
};
btnOpenModal.addEventListner('click', openModal);
btnCloseModal.addEventListner('click', closeModal)
*{
margin: 0;
padding: 0; box-sizing: inherit;
}
html {
font-size: 62.5%;
box-sizing: border-box;
}
body {
font-family: sans-serif;
color: #333;
line-height: 1.5;
height: 100vh;
position: relative;
display: flex;
align-items: flex-start;
justify-content: center;
background: linear-gradient(to top left, #28b487, #7dd56f);
}
.show-modal {
font-size: 2rem;
font-weight: 600;
padding: 1.75rem 3.5rem;
margin: 5rem 2rem;
border: none;
background-color: #fff;
color: #444;
border-radius: 10rem;
cursor: pointer;
}
.close-modal {
position: absolute;
top: 1.2rem;
right: 2rem;
font-size: 5rem;
color: #333;
cursor: pointer;
border: none;
background: none;
}
h1 {
font-size: 2.5rem;
margin-bottom: 2rem;
}
p{
font-size: 1.8rem;
}
/* -------------------------- */
/* CLASSES TO MAKE MODAL WORK */
.hidden {
display: none;
}
.modal {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 70%;
background-color: white;
padding: 6rem;
border-radius: 5px;
box-shadow: 0 3rem 5rem rgba(0, 0, 0, 0.3);
z-index: 10;
}
.overlay {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: rgba(0, 0, 0, 0.6);
backdrop-filter: blur(3px);
z-index: 5;
}
<button class="show-modal">Show modal</button>
<div class="modal hidden">
<button class="close-modal">×</button> <h1>I'm a modal window </h1>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
eiusmod
ea
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex
commodo consequat. Duis aute irure dolor in reprehenderit in voluptate
velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt
mollit anim id est laborum.
</p> </div>
<div class="overlay hidden"></div>
enter link description here

Make 3 div react as closely as possible to video

Im trying to make my final result look something like this https://www.youtube.com/watch?v=SRVtplLrkxk
We have 3 divs lined up horionzontally. The image div is in the center of the 3 div and the rest of the 2 div just contain random letters. I also want my image to keep its aspect ratio as it resize.
Can the flexibility be accomplish using any JavaScript?
This is what I have so far:
<div class="container">
<div class="text-block text-block-one">
<div class="text-wrapper">
<h1>Hello there</h1>
<h3>et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat </h3>
</div>
</div>
<div class="image-block">
<div class="image-container">
<img src="https://via.placeholder.com/450x750">
</div>
</div>
<div class="text-block text-block-two">
<div class="text-wrapper">
<h3>et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat </h3>
</div>
</div>
</div>
my scss:
body, html {
margin: 0;
width: 100%;
height: 100%;
box-sizing: border-box;
background: #efefef;
}
h1,h2,h3 {
margin: 0;
}
h1 {
margin-bottom: 20px;
}
img{
max-width:100%;
display: block;
margin: 0 auto;
object-fit: contain;
}
* {
box-sizing: border-box;
}
.container {
display: flex;
position: relative;
width: 100%;
margin: 0px auto;
.text-block {
width: 37.645448%;
background: #e3e3e3;
padding-top: 250px;
.text-wrapper {
margin: 0 10%;
overflow: auto;
}
}
.image-block {
.image-container {
}
}
}

try using this CSS:
.container {
width: 100%;
height: auto;
display: flex;
flex-direction: row;
}
.image-block{
width: 33%;
height: auto;
}
img{
height: 100%;
width: 100%;
}
.text-block {
width: 33%;
display: flex;
justify-content: center;
align-items: center;
text-align: center;
margin: 0 auto;
}
.text-wrapper {
width: 100%;
height: auto;
}
h3 {
margin: 0 25px;
}
same as of videos

Your CSS is written as SASS (it should be interpreted and rendered CSS, but it's out of the scope here), and I wrote your CSS in actual CSS structure and limited the width of the picture container to 450px, now it looks fine to me:
body, html {
margin: 0;
width: 100%;
height: 100%;
box-sizing: border-box;
background: #efefef;
}
h1,h2,h3 {
margin: 0;
}
h1 {
margin-bottom: 20px;
}
img{
max-width:100%;
display: block;
margin: 0 auto;
object-fit: contain;
}
* {
box-sizing: border-box;
}
.container {
display: flex;
position: relative;
width: 100%;
margin: 0px auto;
}
.text-block {
width: 37.645448%;
background: #e3e3e3;
padding-top: 250px;
}
.text-wrapper {
margin: 0 10%;
overflow: auto;
}
.image-container {
max-width: 450px;
}
See the result here:
https://jsfiddle.net/ypt1vfs3/
Hope that's what you meant to accomplish.

Popup Accordions not working With jQuery?

I am making a popup modal box in which when the user click on more information new modal box again popup on the same page but it's not working properly I have tried everything,Example of Popup Modal if you click more information new box open ups, I am trying something like this.
Also please hide the popup on accept and deny button and set a cookie for popup
CSS
< script src = "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js" > < /script>
$(document).ready(function() {
$(".footerr ul li:last-child").click(function(e) {
e.preventDefault();
$('#popUpContain').css('display', 'none');
$(".serviceMainContent1").css('display', 'block');
})
$("#closeInfoBtn").click(function(e) {
e.preventDefault();
$('#popUpContain').css('display', 'block');
$(".serviceMainContent1").css('display', 'none');
})
$(".cat_btn").click(function(e) {
e.preventDefault();
$(".serv_btn a").css({
"color": "#303030"
});
$(".serv_btn").css({
"border-bottom": "none"
});
$('#services1').css('display', 'none');
$("#category").css('display', 'block');
$(".cat_btn a").css({
"color": "blue"
});
$(".cat_btn").css({
"border-bottom": "2px solid blue"
});
});
$(".serv_btn").click(function(e) {
e.preventDefault();
$(".cat_btn a").css({
"color": "#303030"
});
$(".cat_btn").css({
"border-bottom": "none"
});
$("#category").css('display', 'none');
$('#services1').css('display', 'block');
$(".serv_btn a").css({
"color": "blue"
});
$(".serv_btn").css({
"border-bottom": "2px solid blue"
});
})
var acc = document.getElementsByClassName("accordion1");
var i;
for (i = 0; i < acc.length; i++) {
acc[i].addEventListener("click", function() {
this.classList.toggle("active");
var panel = this.nextElementSibling;
if (panel.style.maxHeight) {
panel.style.maxHeight = null;
} else {
panel.style.maxHeight = panel.scrollHeight + "px";
}
});
}
#import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght#300&display=swap');
* {
margin: 0px;
padding: 0px;
box-sizing: border-box;
font-family: 'Open Sans', sans-serif;
}
a {
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
.popUp {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
z-index: 999;
display: block;
background-color: white;
}
#language {
width: 57px;
padding: 4px;
border: 1px solid #dbdbdb;
}
.header1 {
display: flex;
justify-content: flex-end;
}
.container1,
.serviceMainContent1 {
display: flex;
flex-direction: column;
width: 595px;
padding: 14px;
box-shadow: -1px 16px 34px 2px #dbdbdb;
border-radius: 7px;
}
.bodyy h3 {
color: #303030;
}
.bodyy p {
line-height: 19px;
margin-top: 10px;
font-size: 13px;
}
.footerr>a {
padding: 7px 90px;
border-radius: 9px;
margin: 0px 10px;
}
.footerr>.deny {
background-color: #ededed;
color: #303030;
}
.footerr>.accept {
background-color: #0096FF;
color: #fff;
}
.footerr>.deny:hover {
background-color: #f4f2f2;
}
.footerr>.accept:hover {
background-color: #4eabf7;
}
.footerr>a:hover {
text-decoration: none;
}
.footerr>p {
text-align: center;
padding-top: 10px;
font-size: 12px;
}
.footerr>ul {
display: flex;
list-style: none;
font-size: 13px;
}
.footerr>ul li {
padding-right: 10px;
color: #c4c2c2;
}
/* more information css */
.serviceMainContent1 {
height: 654px;
overflow-y: scroll;
display: none;
}
.header1 a {
font-size: 20px;
width: 40px;
text-align: center;
}
.header1 a:hover {
text-decoration: none;
color: #303030;
}
.categoryServices1 {
height: 436px;
width: 563px;
overflow-y: scroll;
background-color: #f8f7f7;
}
.cat_serv_btn,
.footerBtn {
display: flex;
text-align: center;
}
.cat_serv_btn .cat_btn,
.cat_serv_btn .serv_btn,
.footerBtn a {
width: 50%;
}
.cat_btn,
.serv_btn {
padding: 10px 0px;
}
.cat_btn:active,
.serv_btn:active {
border-bottom: 2px solid blue;
}
.cat_btn a:active,
.serv_btn a:active {
color: blue;
}
.cat_btn a:hover,
.serv_btn a:hover {
text-decoration: none;
}
.bodyy span {
padding: 20px 20px 20px 0;
}
.bodyy a,
.bodyy i {
font-size: 13px;
}
.footerBtn a {
padding: 5px 0px;
border-radius: 5px;
margin: 0px 10px;
color: #303030;
}
.footerBtn a:hover {
text-decoration: none;
}
.footerBtn .save,
.footerBtn .deny {
background-color: #f5f5f5;
}
.footerBtn .save:hover,
.footerBtn .deny:hover {
background-color: #e7e6e6;
}
.footerBtn .close {
background-color: #0096FF;
color: #fff;
}
.footerBtn .close:hover {
background-color: #4eabf7;
}
/* switch buttons */
.switch {
position: relative;
display: inline-block;
width: 50px;
height: 25px;
}
.switch input {
opacity: 0;
width: 0;
height: 0;
}
.slider1 {
position: absolute;
cursor: pointer;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: #ccc;
-webkit-transition: .4s;
transition: .4s;
}
.slider1:before {
position: absolute;
content: "";
height: 18px;
width: 18px;
left: 4px;
bottom: 4px;
background-color: white;
-webkit-transition: .4s;
transition: .4s;
}
input:checked+.slider1 {
background-color: #2196F3;
}
input:focus+.slider1 {
box-shadow: 0 0 1px #2196F3;
}
input:checked+.slider1:before {
-webkit-transform: translateX(26px);
-ms-transform: translateX(26px);
transform: translateX(26px);
}
/* Rounded sliders */
.slider1.round {
border-radius: 34px;
}
.slider1.round:before {
border-radius: 50%;
}
/* accordions */
.accordion1 {
margin: 20px 0px;
width: 500px;
position: relative;
left: 50%;
transform: translateX(-50%);
}
.accordion1 div p {
font-size: 13px;
}
.accordion1 {
display: flex;
background-color: #fff;
color: #444;
cursor: pointer;
padding: 18px;
width: 100%;
border: none;
text-align: left;
outline: none;
font-size: 15px;
transition: 0.4s;
}
.active,
.accordion1:hover {
background-color: #fff;
}
.panel {
padding: 0px 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease-out;
}
.panel p {
font-size: 13px;
}
#services1 {
display: none;
}
/* media query for mobile device */
#media only screen and (max-width: 600px) {
.container {
width: 400px;
}
.footerr>a {
padding: 5px 40px;
}
}
<div class="popUp">
<div class="container1" id="popUpContain">
<div class="header1">
<img src="img/logo.png" alt="" width="20">
<div style="margin-right: auto; margin-left: 10px;"><b>BCT-Touristik</b></div>
<!-- <select name="" id="language">
<option value="DE">DE</option>
<option value="EN">EN</option>
</select> -->
</div>
<div class="bodyy">
<h3>We value your privacy</h3>
<p>We and our partners are using technologies like Cookies or Targeting and process personal data like IP-address or browser information in order to personalize the advertisement you see. This helps us to show you more relevant ads and improves your
internet experience. We also use it in order to measure results or align our website content. Because we value your privacy, we are herewith asking your permission to use the following technologies. You can always change/withdraw your consent
later by clicking on the settings button on the left lower corner of the page.</p>
</div><br>
<div class="footerr">
<ul>
<li><i class="fa fa-link" aria-hidden="true"></i> Privacy Policy</li>
<li><i class="fa fa-link" aria-hidden="true"></i> Legal Notice</li>
<li><i class="fa fa-cog" aria-hidden="true"></i> Travel Condition</li>
<li><i class="fa fa-cog" aria-hidden="true"></i> More information</li>
</ul><br>
<b>Deny</b>
<b>Accept and close</b>
<p>Powered by BCT-Touristik</p>
</div>
</div>
<div class="serviceMainContent1">
<div class="headerBody">
<div class="header1">
<img src="" alt="">
<select name="" id="language">
<option value="DE">DE</option>
<option value="EN">EN</option>
<option value="PT">PT</option>
</select>
✖
</div>
<div class="bodyy">
<h3>Privacy Settings</h3>
<p>This tool helps you to select and deactivate various tags / trackers / analysis tools used on this website. </p>
<span><i class="fa fa-link" aria-hidden="true"></i> Privacy Policy</span>
<span><i class="fa fa-link" aria-hidden="true"></i> Legal Notice</span>
</div>
<div class="cat_serv_btn">
<div class="cat_btn">
<b>Categories</b>
</div>
<div class="serv_btn">
<b>Services</b>
</div>
</div>
<div class="categoryServices1">
<div id="category1">
<div class="accordion2">
<div class="accordion1">
<div>
<h5>Functional</h5>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Eligendi at assumenda laborum rem fugiat accusamus voluptatem minus officiis eius, repellendus consequatur temporib</p>
</div>
<div>
<label class="switch">
<input type="checkbox" checked>
<span class="slider1 round"></span>
</label>
</div>
</div>
<div class="panel">
<hr>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>
</div>
<div class="accordion2">
<div class="accordion1">
<div>
<h5>Functional</h5>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Eligendi at assumenda laborum rem fugiat accusamus voluptatem minus officiis eius, repellendus consequatur temporib</p>
</div>
<div>
<label class="switch">
<input type="checkbox" checked>
<span class="slider1 round"></span>
</label>
</div>
</div>
<div class="panel">
<hr>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>
</div>
<div class="accordion2">
<div class="accordion1">
<div>
<h5>Functional</h5>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Eligendi at assumenda laborum rem fugiat accusamus voluptatem minus officiis eius, repellendus consequatur temporib</p>
</div>
<div>
<label class="switch">
<input type="checkbox" checked>
<span class="slider1 round"></span>
</label>
</div>
</div>
<div class="panel">
<hr>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>
</div>
<div class="accordion2">
<div class="accordion1">
<div>
<h5>Functional</h5>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Eligendi at assumenda laborum rem fugiat accusamus voluptatem minus officiis eius, repellendus consequatur temporib</p>
</div>
<div>
<label class="switch">
<input type="checkbox" checked>
<span class="slider1 round"></span>
</label>
</div>
</div>
<div class="panel">
<hr>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>
</div>
</div>
<div id="services1">
<div class="accordion2">
<div class="accordion1">
<div>
<h5>Services</h5>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Eligendi at assumenda laborum rem fugiat accusamus voluptatem minus officiis eius, repellendus consequatur temporib</p>
</div>
<div>
<label class="switch">
<input type="checkbox" checked>
<span class="slider1 round"></span>
</label>
</div>
</div>
<div class="panel">
<hr>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>
</div>
<div class="accordion2">
<div class="accordion1">
<div>
<h5>Services</h5>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Eligendi at assumenda laborum rem fugiat accusamus voluptatem minus officiis eius, repellendus consequatur temporib</p>
</div>
<div>
<label class="switch">
<input type="checkbox" checked>
<span class="slider1 round"></span>
</label>
</div>
</div>
<div class="panel">
<hr>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>
</div>
</div>
</div>
<div class="footer">
<br>
<div class="footerBtn">
<a class="save" href=""><b>Save</b></a>
<a class="deny" href=""><b>Deny</b></a>
<a class="close" href=""><b>Accept and close</b></a>
</div>
<p>Powered by Usercentrics Consent Management</p>
</div>
</div>
</div>
</div>
</div>
Suggest me where I am going wrong in this I need to open another modal box on more info click?

Revealing transition of div when hovering over it

I'm trying to create a "hover to reveal content" div
Like this:
html {
margin: 0;
height: 100%;
min-height: 100%;
}
body {
margin: 0;
height: 100%;
min-height: 100%;
background-color: red;
}
hr {
transition: width 1s;
width: 5rem;
margin: 0 auto 0 auto;
}
#container {
width: 50%;
height: 100%;
padding: 5rem;
background-color: white;
margin: auto;
}
.expand {
width: 100%;
height: 1rem;
padding: 1rem 0 1.1rem 0;
background: inherit;
transition: height 0.5s;
text-align: center;
}
.wrapper:hover>.expand {
height: auto;
}
.wrapper:hover>hr {
width: 100%;
}
.text {
margin: 1rem 0 0 0;
overflow: hidden;
height: 0;
transition: height 0.5s;
}
.wrapper:hover .text {
height: 16rem;
transition: height 1s;
}
<div id="container">
<div class="wrapper">
<hr>
<div class="expand">
Hover to Learn more
<div class="text">
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</div>
</div>
<hr>
</div>
</div>
But I'm facing a few problems:
As you can see when running the sample code it opens perfectly but
when hovering out of the div there is no closing transition
I have to manually add a value height:16rem instead of automatically assigning the height required
.wrapper:hover .text {
height: 16rem;
transition: height 1s;
}
(this becomes and issue when the browser is resized)
my best guess is that both the issues arise because of the height:auto source
so I'm guessing it's almost impossible to fix via css but is there any javascript solution (ideally using Vanilla js)?

One way I have worked around this exact challenge was to avoid trying to transition a dynamic element's height. You can still achieve a similar 'feel' by using something like:
.wrapper {
transition: transformY(0);
opacity: 0;
height: 0;
}
.wrapper:hover {
transition: transformY(10px);
height: auto; // Don't animate this property
opacity: 1;
}

Sliding Animation Stutters in Accordion

I have an accordion menu with tabs. When you click on the tabs, information is displayed below one of them, by sliding up and down smoothly.
The problem is that there is a stutter in the animation, during slideUp and slideDown. I also tried animate and adjusting some of the css, but I can't figure it out.
If it helps, here's the fiddle.
HTML:
<div class="project-container">
These don't slide well:
<ul class="project-nav">
<li class="project-tab" id="project-tab-1"><a id="project-tab-link" href="#" class="active">Tab 1</a>
<section class="is-open">
<p id="current-project-title">TITLE</p>
<p>TEXT HERE</p>
</section>
</li>
<li class="project-tab" id="project-tab-2"><a id="project-tab-link" href="#">Tab 2</a>
<section>
INFO HERE<br>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</section>
</li>
</ul>
</div>
<br>
But this slides VERY well:
<br>
<button class="toggle-info">toggle slider<i class="glyphicon glyphicon-chevron-down"></i></button>
<section class="info-container">
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. </section>
Javascript:
$(document).ready(function() {
var Tabs = {
el: {
nav: $(".project-nav"),
tabs: $(".project-nav > .project-tab > a"),
panels: $(".project-nav > .project-tab > section"),
},
init: function() {
Tabs.bindUIActions();
},
bindUIActions: function() {
Tabs.el.nav
.on(
'click',
'.project-tab > a:not(.active)',
function(event) {
Tabs.deactivateAll();
Tabs.activateTab(event);
event.preventDefault();
}
);
},
deactivateAll: function() {
Tabs.el.tabs.removeClass("active");
Tabs.el.panels.removeClass("is-open").slideUp('slow');
},
activateTab: function(event) {
$(event.target)
.addClass("active")
.next()
.addClass("is-open").slideDown('slow');
}
};
Tabs.init();
////// Slide Doesn't Work For Tabs
$('.project-tab section.is-open').slideDown('slow');
////// Slide Works For Toggle Button
$('.toggle-info').click(function() {
$('.info-container').slideToggle('slow');
$("i", this).toggleClass("glyphicon glyphicon-chevron-right glyphicon glyphicon-chevron-down");
});
});

This your problem
.project-nav section, .project-nav section.is-open, .project-nav .project-tab a:hover, .project-nav .project-tab a.active, #current-project-link,
#current-project-link:hover, .project-nav section.is-open, .project-nav section {
-webkit-transition: all .5s;
-moz-transition: all .5s;
-o-transition: all .5s;
transition: all .5s;
}
You add transition css to slide element, it make slide effect not working correctly, you must remove it
you can try this jsfiddle

I was able to achieve the desired effect using CSS, instead of jquery. I used max-height transitions to make the tabs slide both up and down smoothly.
Here's the updated fiddle.
And here's the new CSS:
///// RESPONSIVE ACCORDION TO TABS
.project-container {
display: block;
}
.project-nav {
list-style: none;
position: relative;
}
.project-nav a:active{
opacity:1;
}
.project-nav .project-tab {
display: inline;
}
.project-nav > .project-tab > a {
display: inline-block;
padding: 10px 15px;
background-color: #00A88C;
border: solid 1px #00A88C;
border-radius: 0px 10px;
text-decoration: none;
color: #fff;
width:40%;
font-size: 30pt;
clear: both;
text-align: center;
}
#project-tab-1 {
margin-right: 2%;
margin-left: 7%;
}
#project-tab-2 {
margin-left: 2%;
}
#project-tab-link:hover {
background-color: #13ebc7;
border-color: #13ebc7;
}
#project-tab-link.active {
color: #00A88C!important;
background-color: rgba(19, 235, 199, 0)!important;
}
#project-tab-link.active:hover {
border-color: #00A88C;
}
.project-nav section {
position: absolute;
top: -9999px;
left: -9999px;
float: left;
color:#5c5c5c;
overflow: hidden;
border: solid 1px #00A88C;
width:100%;
margin-top:10px;
padding-bottom: 15px;
opacity: 0;
}
.project-nav section.is-open {
position: static;
opacity: 100;
}
.project-tab section p {
font-family:'century gothic';
padding: 0px 30px;
}
.project-tab section p:empty {
display: none;
}
#current-project-title{
font-size: 16pt;
}
#current-project-link {
float: right;
padding: 5px;
background: #00A88C;
color:#fff;
margin-right: 30px;
width: auto;
}
#current-project-link:hover {
background: #13ebc7;
}
.project-nav section, .project-nav section.is-open, .project-nav .project-tab a:hover, .project-nav .project-tab a.active, #current-project-link,
#current-project-link:hover, .project-nav section.is-open, .project-nav section {
-webkit-transition: all .5s;
-moz-transition: all .5s;
-o-transition: all .5s;
transition: all .5s;
}
#media only screen and (max-width: 730px) {
#front-page-textbox{
background: #0f2347;
color: #fff;
}
.project-container {
margin-bottom: 10px;
}
.project-nav .project-tab a {
display: block;
width:100%;
border-radius: 0px;
}
#project-tab-1, #project-tab-2 {
margin-left: 0;
margin-right: 0;
}
.project-nav .project-tab a.active {
border: solid 1px #13ebc7;
}
.project-nav section {
margin:0;
position: relative;
top: auto;
left: auto;
float: none;
max-height:0;
padding-bottom: 0px;
opacity: 100;
}
.project-nav section.is-open {
border-radius: 0px;
border-top: none;
max-height: 1200px;
}
.project-tab > a:after {
font-family: 'Glyphicons Halflings';
content: "\e080";
float: right;
font-size: 20pt;
margin-top: 10px;
}
.project-tab > a.active:after{
font-family: 'Glyphicons Halflings';
content: "\e114";
float:right;
font-size: 20pt;
margin-top: 10px;
}
/// TOGGLE BUTTON
.toggle-info {
display: block;
width: 100%;
color: #f5f5f5;
padding: 10px 15px;
background-color: #00A88C;
font-size: 30pt;
}
.toggle-info i{
font-size: 10pt;
margin-top: 10px;
float: right;
display: block;
}
.toggle-info:hover {
background-color: #13ebc7;
}
.toggle-info, .toggle-info:hover {
-webkit-transition: all .5s;
-moz-transition: all .5s;
-o-transition: all .5s;
transition: all .5s;
}
.info-container{
padding: 10px 15px;
border: solid 1px #00A88C;
}