.vidcover {
  opacity: 0;
  display: block;
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
}

.fullvid {
  width: 1280px;
  height: 720px;
  position: fixed;
  bottom: 50%;
  left: 50%;
  z-index: -2;
  -webkit-transform: translate(-50%, 50%);
  -moz-transform: translate(-50%, 50%);
  -ms-transform: translate(-50%, 50%);
  transform: translate(-50%, 50%);
}