.age-container{max-width:320px;margin:0 auto;text-align:center;padding:10px;background-color:#f2f2f2}h1{color:#333}label{display:block;margin-bottom:10px}input[type=date]{padding:8px;margin-bottom:10px}button{padding:10px 20px;background-color:#4caf50;border-radius:3px;color:#fff;border:none;cursor:pointer}p{margin-top:20px;font-weight:700}