body,
html {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #333;
}

canvas {
  background-color: black;
  border: 2px solid #000;
}

#score {
  margin-top: 20px;
  color: #fff;
  font-size: 24px;
  font-family: Arial, sans-serif;
}