JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
	<title>Border-radius test</title>

</head>
<body>

		<video id="capsule" src="http://clips.vorwaerts-gmbh.de/VfE_html5.mp4" autoplay muted loop></video>
</body>
</html>

CSS

body{
			background: #000000;
			margin: 0px;
		}

		#capsule{
			height: 600px;
			background: #000;
			border-radius: 1000px;
		}