/* fade image in after load */
.lazyload,
.lazyloading {
opacity: 0;
}
.lazyloaded {
opacity: 1;
transition: opacity 300ms;
}
/* fade image in while loading and show a spinner as background image (good for progressive images) */
.lazyload {
opacity: 0;
}
.lazyloading {
opacity: 1;
transition: opacity 300ms;
background: #f7f7f7 url(loader.gif) no-repeat center;
}