.spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid transparent;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#loading {
    text-align: center;
    margin: 20px;
}