How to create a website background using YouTube video !

 <style>
@import url("https://fonts.googleapis.com/css?family=Roboto:400,400i,700");
body{
  overflow-x: hidden;
  font-family: Roboto, sans-serif;
}

.video-container{
  width: 100vw;
  height: 100vh;
}

 iframe {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100vw;
  height: 100vh;
  transform: translate(-50%, -50%);
}

h1{
  background: rgba(0,0,0,0.5);
  padding: 10px;
}

#text{
  position: absolute;
  color: #FFFFFF;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

@media (min-aspect-ratio: 16/9) {
  .video-container iframe {
    height: 56.25vw;
  }
}
@media (max-aspect-ratio: 16/9) {
  .video-container iframe {
    width: 177.78vh;
  }
}

</style>



<div class="video-container">
  <iframe src="https://www.youtube.com/embed/jlkXyi0wOOA?controls=0&autoplay=1&mute=1"></iframe>
</div>

<div id="text">
  <h1>Use a youtube video as a full screen background with CSS</h1>
</div>