.ct-ajax-list-table .wp-list-table {
    position: relative;
}

.ct-ajax-list-table-loader {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    text-align: center;
    background-color: rgba(255,255,255,0.5) !important;
}

.ct-ajax-list-table-loader .spinner {
    float: none;
    position: absolute;
    top: 50%;
}