html, body {
    position: relative;
    margin: 0;
    height:1500px;
    
  }
  
  .container {
    position: fixed;
    width: 100%;
   
  }
  
  video {
    width: 100%;
  }
  
  .overlay {
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
  }