JSFiddle - React, Tailwind, and code Playground

by uttara

HTML

<div class="triangle"></div>

CSS

.triangle {
    border-bottom : 60px solid black;
    border-left : 60px solid black;
    border-radius: 0 0 100% 0;
    width: 0px;
    box-shadow: 0 0 10px black;
    -moz-box-shadow:0 0 10px black;
    -webkit-box-shadow: 0 0 10px black;
}