body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f4f9;
}
.container {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 300px;
    text-align: center;
}
input, select, button {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    height: 40px;
    font-size: 14px;
}
select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 15px;
}
button {
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
}
button:hover {
    background-color: #45a049;
}
#submit-btn {
    background-color: #2196F3;
}
#submit-btn:hover {
    background-color: #0b7dda;
}
.hidden {
    display: none;
}
#error-message {
    color: red;
    font-size: 13px;
    margin-top: 5px;
    height: 16px;
}