JSFiddle - React, Tailwind, and code Playground

HTML

<div class="ellipse"></div>

CSS

body {
    background-color:red;
}

.ellipse {
    height: 10em;
    background: radial-gradient(ellipse at 50% 100%, transparent 50px, rgba(84, 82, 94, 0.8) 50px);
}