#pet-age-calculator{max-width:400px;margin:20px auto;padding:15px;border:1px solid #ccc;border-radius:5px;background:#f9f9f9}#pet-age-calculator label{display:block;margin:10px 0 5px}#pet-age-calculator input,#pet-age-calculator select{width:100%;padding:8px;margin-bottom:15px;border:1px solid #ddd;border-radius:4px}#pet-age-calculator button{background:#0073aa;color:#fff;border:none;padding:10px;border-radius:4px;cursor:pointer}#pet-age-calculator button:hover{background:#005f8d}