JSFiddle - React, Tailwind, and code Playground

HTML

<div id="circle"></div>

CSS

#circle{
border-top: 5px solid black;
border-left: 5px solid black;
border-right: 5px solid transparent;
border-bottom: 5px solid transparent;
transform: rotate(45deg);
border-radius: 100px;
width: 150px;
height: 150px; 
}