#loader{
    position: absolute;
    z-index: 9999;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-color: rgba(0,0,0,0.8);
}

.slice{
    margin-top: 40% !important;
    margin-left: calc(50% - 24px) !important;
}