body { font-family: Arial, sans-serif; text-align: center; background: #f0f0f0; padding: 20px; }
.controls { margin: 20px 0; display: flex; flex-direction: column; gap: 12px; max-width: 500px; margin: 20px auto; }
input, select, button { padding: 10px; font-size: 16px; }
canvas { border: 2px solid #333; background: white; max-width: 100%; height: auto; }