JSFiddle - React, Tailwind, and code Playground

HTML

<div id="box"></div>
<div id="box-after"></div>

CSS

#box{
    background-color: #e5e5e5;
    width: 400px;
    height: 200px;
    margin: 0 auto;
    float: left;
}

#box-after{
    background-color: white;
    border-radius: 600px;
    height: 600px;
    width: 600px;
    float: left;
    position: relative;
    right: 100px;
    top: -200px;
}