JSFiddle - React, Tailwind, and code Playground

HTML

<div id=red><div id=blue></div></div>

CSS

div {
    width: 250px;
    height: 250px;
    border-radius:25px;
}

#red {
    margin: 25px;
    border:2px solid red;
}

#blue {
    border: 2px solid blue;
}