body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.container {
    background-color: #ffffff;
    padding: 2em;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    text-align: center;
}
h1 {
    color: #434f94;
    margin-bottom: 1em;
}
label {
    display: block;
    font-size: 1.2em;
    margin-bottom: 0.5em;
    color: #333;
}
select, button {
    font-size: 1em;
    padding: 0.5em;
    margin-top: 1em;
    width: 100%;
    border: 1px solid #ccc;
    border-radius: 5px;
}
button {
    background-color: #434f94;
    color: #fff;
    border: none;
    cursor: pointer;
}
button:hover {
    background-color: #512da8;
}
.spinner {
    display: none;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-top: 4px solid #512da8;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}