JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <p>div 1</p>
        <div id="id1">
            <p>div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 div 2 </p>
        </div>
</div>

<div id="button">
<a href="#id1">click</a>
</div>

CSS

body {
    margin: 0px;
    padding: 0px;
    background-color: #d9d9d9;
    font-family: Sans-Serif;
    font-weight: 100;    
    color: #ffffff;
}
.container {
    position: absolute;
    margin: 0px;
    padding: 0px;
    left:50px;
    top: 50px;
    width: 500px;
    height: 150px;
    background: #333333;
    border: 2px solid #000000;
}
#id1 {
    position: absolute;
    margin: 0px;
    padding: 0px;
    top: 0px;
    left: 500px;
    width: 0px;
    height: 150px;
    background: #008080;
    overflow: hidden;
}
#id1 > p {
    width: 500px;
}
#id1:target {
    -webkit-animation: slide 0.5s ease-in forwards;
}

@-webkit-keyframes slide {
  0%   { left: 500px; top: 0px; width:  0px; }
  100% { left:   0px; top: 0px; width:500px; }
}

#button {
    position: absolute;
    top: 15px;
    left: 50px;
    width: 80px;
    height: 25px;
    padding: 5px 0px 0px 0px; 
    margin: 0px;
    text-align: center;
    background: #ffffff;
}