使用视频作为网页背景

想做一个背景为视频的页面

下面这篇文章很好

• https://css-tricks.com/full-page-background-video-styles/ -https://www.w3schools.com/howto/howto_css_fullscreen_video.asp

<video playsinline autoplay muted loop poster="polina.jpg" id="bgvid">
  <source src="polina.webm" type="video/webm">
  <source src="polina.mp4" type="video/mp4">
</video>

video {
  object-fit: cover;
  width: 100vw;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
}