JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.half-circle {
    width: 60px;
    height: 120px;
    border-top-left-radius: 110px;
    border-bottom-left-radius: 110px;
    border: 10px solid gray;
    border-right: 0;
}