body {
    width: 100vw;
    height: 90vh;
    background: black;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    
}

#myVideo {
    width: 90%;
  height: auto;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
    background-color: black;
}