.lazy-container {
    background: url("../images/spinner.gif") no-repeat center center;
    background-size: 22px;
}
img.lazy-img, picture.lazy-img {
    transition: opacity 0.5s linear;
}
img.lazy-img.lazy-init, picture.lazy-img.lazy-init {
    /*transition: opacity 0s linear;*/
    opacity: 0;
}
/*img.lazy-img.lazy-loading {
    opacity: 0;
}*/
img.lazy-img.lazy-loaded, picture.lazy-img.lazy-loaded {
    opacity: 1;
}