body {
  background-color: black;
  color: white;
  font-family: monospace;
  text-align: center;
  margin: 0;
  padding: 0;
}

#game-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 20px;
}

canvas {
  border: 2px solid #0ff;
}

#inventory {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.9);
  border: 2px solid #0ff;
  padding: 20px;
  width: 250px;
  display: none;
}

#inventory button {
  background: #111;
  color: #0ff;
  border: 1px solid #0ff;
  margin-top: 5px;
  cursor: pointer;
}