.spinner-backdrop {
    position: relative;
    min-height: 20px;
    max-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #ddd;
    border-top-color: #333;
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

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