JSFiddle - React, Tailwind, and code Playground

HTML

<div class="oval"></div>

CSS

.oval {
  -webkit-box-sizing: content-box;
  -moz-box-sizing: content-box;
  box-sizing: content-box;
  width: 200px;
  height: 100px;
  border: none;
  -webkit-border-radius: 50%;
  border-radius: 50%;
  font: normal 100%/normal Arial, Helvetica, sans-serif;
  color: rgba(0,0,0,1);
  -o-text-overflow: clip;
  text-overflow: clip;
  border: 1px solid #1abc9c;
}