body, html {
  margin: 0;
  padding: 0;
  overflow: hidden;
  width: 100%;
  height: 100%;
  font-family: Arial, sans-serif;
}

#gameContainer {
  width: 100vw;
  height: 100vh;
  background-color: #000;
  cursor: crosshair;
}

#healthContainer {
  position: absolute;
  top: 20px;
  left: 20px;
  width: 200px;
  height: 20px;
  background-color: #555;
}

#healthBar {
  width: 100%;
  height: 100%;
  background-color: #0f0;
}

#crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 4px;
  background-color: white;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  z-index: 10;
}