JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#cont" class="run-css">CSS slideToggle</a>
<div id="cont">Toggle this div</div>

CSS

#cont:target {
    width: 100px;
    height: 100px;
    border: 1px #CCC solid;
    background-color: #EEE;
    padding: 5px;
    transition: height .3s linear, padding-top .3s linear,
        padding-bottom .3s linear, border-width .3s linear;
    -webkit-transition: height .3s linear, padding-top .3s linear,
        padding-bottom .3s linear, border-width .3s linear;
    
}

#cont {
    overflow: hidden;
    padding-top: 0;
    padding-bottom: 0;
    height: 0;
    border-width: 0;
}