#tenhay-wrapper {
    padding: 10px;
    background: #f9f9f9;
    border: 1px solid #ccc;
    max-width: 400px;
    margin: 20px auto;
    border-radius: 8px;
}
#tenhay-wrapper select, #tenhay-wrapper button {
    margin-top: 10px;
    padding: 6px 12px;
    font-size: 16px;
}
#tenhay-result {
    font-size: 1.5em;
    font-weight: bold;
    margin-top: 15px;
    color: #2c3e50;
    text-align: center;
}