JSFiddle - React, Tailwind, and code Playground

HTML

<div id="screen"><i class="material-icons" id="button">menu</i>

    <div id="sidebar">
        <ul>
            <li><a href="#1">Nav 1</a>
            </li>
            <li><a href="#2">Nav 2</a>
            </li>
            <li><a href="#3">Nav 3</a>
            </li>
        </ul>
    </div>
    <hr />
    <div>Hello</div>
</div>

CSS

/*
#button {
    display: block;
    text-decoration: none;
    margin-top: 20px;
    margin-left: 50px;
    color: white;
    width: 20px;
    height:20px;
    font-size: 30px;
    transition: width 0.5s;
    background-color: black;
    text-align: center;
    padding-bottom: 30px;
    box-sizing: border-box;
}*/
 #button {
     margin-top: 20px;
     margin-left: 50px;
     font-size: 30px;
     cursor: hand;
 }
 #sidebar {
     position: absolute;
     background-color: black;
     left: -200px;
     top: 0px;
     width: 200px;
     height: 100%;
     transition: width 0.5s;
     opacity: 0.7;
     padding-top:50px;
     -webkit-transition: left 1s;
    transition: left 1s;
 }
 #sidebar ul {
     list-style-type:none;
 }
 #screen {
     position: fixed;
     background-color: tan;
     height: 100%;
     width: 100%;
     left: 0px;
     top: 0px;
 }
 #sidebar:hover, #button:hover + #sidebar {
     left: 0;
     -webkit-transition: left 1s;
    transition: left 1s;
 }