.spinner {
    display: none;
    width: 1.2em;
    height: 1.2em;
    border: 2px solid #ccc;
    border-top-color: #666;
    border-radius: 50%;
    vertical-align: middle;
    animation: admin-spinner-spin 0.6s linear infinite;
}

@keyframes admin-spinner-spin {
    to { transform: rotate(360deg); }
}