JSFiddle - React, Tailwind, and code Playground
HTML
<button id="myClick">Click Me</button>
<div class="a"></div>
CSS
.a{
position:relative;
width: 200px;
height: 100vh;
background: red;
transition: all ease 0.5s;
}
.c{
background:#000;
}
.c:before{
content:'Leave';
color:#fff;
display: block;
height:10px;
}
.b{
width:20px;
transition: all ease 0.5s;
}
JavaScript
$('#myClick').click(function(){
$('.a').toggleClass('b');
$(this).toggleClass('c');
});