JSFiddle - React, Tailwind, and code Playground

by Gregor Adams

HTML

<div id="foo">
    <div id="bar">
    </div>
</div>

CSS

body{background:green;}

#foo{
    height:150px;
    width:250px;
    background:rgba(0, 0, 0, 0.6);
    position:absolute;
    left:40%;
    top:20%;
}

#bar{
    height:40px;
    width:40px;
    background-image: -webkit-linear-gradient(transparent 50%, rgb(0, 0, 0) 50%, rgb(0, 0, 0)),
        -webkit-linear-gradient(0deg, transparent 50%, rgb(0, 0, 0) 50%, rgb(0, 0, 0));
    opacity: 0.6;
    -webkit-transform: rotate(180deg);
    border-radius:40px;
    position:absolute;
    background-size: 50px;
    top:-15px;
    left:-15px;
}