body {
  margin: 0;
  overflow: hidden;
  background-color: #222;
  font-family: sans-serif;
  color: white;
}

#game-area {
  position: relative;
  width: 100vw;
  height: 100vh;
  background-color: #333;
  overflow: hidden;
}

#pistol {
  position: fixed;
  bottom: 20px;
  left: 50%;
  width: 100px;
  transform: translateX(-50%);
  z-index: 10;
}

#tikus {
  position: absolute;
  width: 80px;
  transition: top 0.2s, left 0.2s;
  cursor: pointer;
}

#score {
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 24px;
}