JSFiddle - React, Tailwind, and code Playground

by flyingL123

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<span id="container">+</span>

CSS

#container {
    font-size: 20px;
    display: block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid black;
    line-height: 16px;
    text-align: center;
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}