.app{text-align:center;font-family:sans-serif}.grid{grid-template-columns:repeat(4,80px);justify-content:center;gap:12px;margin-top:24px;display:grid}.card{cursor:pointer;background:#888;border:none;border-radius:12px;width:80px;height:80px;font-size:36px}.card.flipped{background:#fff;border:2px solid #888}.play-again{cursor:pointer;margin-top:24px;padding:10px 18px;font-size:16px}