.container{max-width:800px;margin:0 auto;padding:20px;font-family:Arial,sans-serif}h1{text-align:center}form{display:flex;gap:10px;margin-bottom:20px}input{flex:1;padding:8px}button{padding:8px 16px;cursor:pointer}table{width:100%;border-collapse:collapse}th,td{border:1px solid #ddd;padding:10px;text-align:left}th{background-color:#f4f4f4}