JSFiddle - React, Tailwind, and code Playground

HTML

<div class="video-size">
<video  autoplay loop controls muted>
  <source src="http://techslides.com/demos/sample-videos/small.mp4" type="video/mp4">
</video>
</div>

CSS

.video-size video
{
  width: 100%;
  height: 800px;
}