* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background-color: black;
}

#canvas1 {
  border: 5px solid black;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 100%;
  max-height: 100%;
  font-family: 'Silkscreen', sans-serif;
}

#player, #layer1-wall, #layer2-floor, #layer3-machines, #layer4-workspace, #boss-layer, #robot-bat, #skeleton-bomb, #electric-gate, #skeleton-bomb-explosion, #boom, #bullet, #shield-bubble, #fire, #power-up-item, #boss-enemy, #boss-jets, #game-lobby {
  display: none;
}