body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #a1c4fd, #c2e9fb);
  text-align: center;
}

header {
  padding: 20px;
  background: rgba(255,255,255,0.8);
}

.back-btn {
  margin-top: 10px;
  display: inline-block;
  padding: 8px 15px;
  background: #0984e3;
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
}

canvas {
  background: #74b9ff;
  border: 3px solid #333;
  border-radius: 10px;
}

.score-board {
  margin-top: 15px;
  font-size: 1.2rem;
}