JSFiddle - React, Tailwind, and code Playground

by Darby Rathbone

HTML

<div class='sidebar'>∶</div>

CSS

.sidebar{
    position:fixed;
    top:0px;
    left:0px;
    width:1rem;
    height:1rem;
    outline:solid;
        transition:.2s all linear;
}
.sidebar:hover{

    width:25%;
    height:100%;
}