JSFiddle - React, Tailwind, and code Playground

by salt

HTML

<div class="half-circle"></div>

CSS

.half-circle {
  margin-top:100px;
  margin-left:-30px;
    width: 100px;
    height: 300px;
    background-color: black;
    border-top-right-radius: 100%;
    border-bottom-right-radius: 100%;;
    transform:scaleY(1);
    
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}