<p>Resize the green box ↘️</p>

<main>
  <video controls playsinline src="http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" />
</main>

video {
  height: 0;
  width: 0;
  min-height: 100%;
  min-width: 100%;
}
















main {
  height: 250px;
  width: 250px;
  resize: both;
  overflow: auto;
  background-color: green;
  border: 5px solid black;
}