/* reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  overflow: hidden;
  background: #000;
  font-family: sans-serif;
}

#game {
  position: absolute;
  top: 0;
  left: 0;
}

#scoreboard {
  position: absolute;
  top: 20px;
  left: 20px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  padding: 8px;
  border-radius: 4px;
  font-size: 14px;
  z-index: 10;
}