body{font-family:Arial;background:#f4f7fb;margin:0}header{background:#0b5ed7;color:#fff;padding:20px;text-align:center}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;padding:20px}.card{background:#fff;padding:20px;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,.15);text-align:center}button{background:#0b5ed7;color:#fff;border:0;padding:10px 16px;border-radius:8px}