JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo"></div>

CSS

#foo:after{
    content: '';
    width: 200px;
    height: 200px;
    background: red;
    display: block;
    -webkit-transition: all .4s ease-in-out;
    -moz-transition: all .4s ease-in-out;
    -o-transition: all .4s ease-in-out;
    transition: all .4s ease-in-out;
}


#foo,
#foo:hover:after,
#foo:hover:before{
    width: 250px;
    height: 250px;
}