body {
  margin: 0;
  background: #000;
}

video {
  position: fixed;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  z-index: -100;
  transform: translateX(-50%) translateY(-50%);
}
.container {
  margin-top: 3vh;
}

.jumbotron {
  min-width: 100%;
  width: 100%;
}

#quiz_ui,
#time-alert,
hr,
#correct-id,
#incorrect-id,
#timeout-id,
#gameover-id {
  display: none;
}

footer {
  z-index: -1000;
}