.loading_bg {
    width: 100%;
    height: 100%;
    position: absolute;
    z-index: 2;
    visibility: collapse;
    background-position: center center;
    /* Center and scale the image nicely */
    background-repeat: no-repeat;
    background-size: cover;
}

.no-webp .loading_bg {
    background-image: url("loading.png");
}

.webp .loading_bg {
    background-image: url("loading.webp");
}