JSFiddle - React, Tailwind, and code Playground

by jackdent

HTML

<div id="header">Header</div>
<div href="#" id="expand">Expand</div>

CSS

#expand {
    display: none;
    background-color: #C3C3C3;
}
#header {width: 100%; background-color: gray;}
#header:active + #expand {
    display: block;
}