JSFiddle - React, Tailwind, and code Playground

HTML

<div class="background-video">
  <video autoplay loop muted>
    <source src="somevideo.mp4" type="video/mp4">
  </video>
</div>

CSS

.background-video
{
	position: relative;
}

.background-video video
{
	position: absolute;
	top: 0;
	right: 0;
	left: 0;
	margin: 0 auto;
	height: 1080px;
	width: 100%;
}