JSFiddle - React, Tailwind, and code Playground

HTML

<div id="hill3Cont">
    <div id="hill3Hill">some content</div>
</div>

CSS

#hill3Cont
{
    margin-top: 50px;
    width: 200px;
    height: 200px;
    background-color: red;
}
#hill3Hill 
{
    height: 50px;
    width: 100px;
    background: blue;
    position: relative;
    top: -20px;
}