.dataTables_processing {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 1em;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    z-index: 100;
}