JSFiddle - React, Tailwind, and code Playground

by Debraj Rakshit

HTML

<div class="curv">
    <div class="holder"></div>
</div>

CSS

.curv{
    width: 800px;
    margin: 0 auto;
    position: relative;
    padding-top: 100px;
    overflow: hidden;
}
.curv:before{
    background: #333;
    width: 100%;
    height: 200px;
    left: 0px;
    right: 0px;
    top: 0px;
    content: '';
    position: absolute;
    border-radius: 100% 100% 0 0;
}
.holder{
    width: 100%;
    height: 200px;
    background: #333;
    position: relative;
    z-index: 9999;
}