#myVideo {
        position: absolute;
        right: 0;
        bottom: 0;
        min-width: 100%;
        min-height: 100%;
      }
      @media only screen and (max-width: 480px){
        #myVideo {
          display:none;
        }
      }

      #myVideoMob {
        display:none;

      }
      @media only screen and (max-width: 480px){


        #myVideoMob {
          display:block;
          position: absolute;
          right: 0;
          bottom: 0;
          min-width: 100%;
          min-height: 100%;
        }
      }