body {
  margin: 0;
  background: #000; 
}
video { 
    position: fixed;
/*    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;*/
    width: 100%;
    height: auto;
/*    z-index: -100;
    transform: translateX(-50%) translateY(-50%);
  background-size: cover;*/
}