JSFiddle - React, Tailwind, and code Playground

HTML

<div id='parent'>
    <div id='child'>
    </div>
</div>

CSS

#parent {
    width: 250px;
    height: 250px;
    overflow: auto;
    background: blue;
}

#child {
    background: red;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    border: 8px solid black;
     min-height: 100%;
     min-width: 100%;
}