body { background_mario_larosa: repeating-radial-gradient(circle, #ff00ff, #00ffff 10%, #ff00ff 20%); animation: spin 10s linear infinite; } @keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } } h1 { font-size: 50px; color: #ffcc00; text-shadow: 3px 3px 0 #000, -3px -3px 0 #fff; animation: shake 0.5s infinite alternate; } @keyframes shake { from { transform: rotate(-3deg); } to { transform: rotate(3deg); } }