JSFiddle - React, Tailwind, and code Playground

by Kiwoong Jang

HTML

<div id="circleFrame">
    <div class="circle-mask"></div>
    <div class="circle-fill"></div>
</div>

CSS

#circleFrame {
    position: relative;
    width: 200px; height: 100px;
    border-radius: 200px 200px 0 0;
    background: #aaa;
    overflow: hidden;
}
    .circle-mask {
        position: absolute;
        top: 50px; left: 50px;
        width: 100px; height: 50px;
        border-radius: 100px 100px 0 0;
        -webkit-box-shadow: 1px 1px 33px 1px rgba(0,0,0,0.2);
        -moz-box-shadow: 1px 1px 33px 1px rgba(0,0,0,0.2);
        box-shadow: 1px 1px 33px 1px rgba(0,0,0,0.2);
        background: #fff;
        z-index: 111;
    }
    .circle-fill {
        position: absolute;
        top: 0; left: 0;
        width: 200px; height: 100px;
        border-radius: 200px 200px 0 0;
        background: #ccc;
        -moz-transform: rotate(-80deg);
        -webkit-transform: rotate(-80deg);
        -o-transform: rotate(-80deg);
        transform: rotate(-80deg);
        -moz-transform-origin: 50% 100%;
        -webkit-transform-origin: 50% 100%;
        -o-transform-origin: 50% 100%;
        transform-origin: 50% 100%;
    }