JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">
    <div id="div2">
    </div>
</div>

CSS

#div1 {
    height: 300px;
    width: 200px;
    border: 2px solid red;
    padding:0 0 4px 0;
}
#div2 {
    height:10px;
    width: 20px;
    border: 2px solid blue;
}