.container{width:600px;margin:30px auto 20px;border:1px solid #ccc;border-radius:8px;padding:20px}@media only screen and (max-width:600px){.container{width:94%}}.input-group{margin-bottom:15px}label{display:block;margin-bottom:5px}input,select{width:100%;padding:8px;margin-bottom:10px;border:1px solid #ccc;border-radius:4px}button{background-color:#0056b3;color:#fff;padding:10px 15px;border:none;border-radius:4px;cursor:pointer}button:hover{background-color:#003d80}.result{margin-top:15px;font-weight:700}