.sdLazy {
    opacity: 0;
}

    .sdLazy.sdLazyVisible {
        opacity: 1;
        -webkit-transition: all 600ms ease-in 0s;
        -moz-transition: all 600ms ease-in 0s;
        -o-transition: all 600ms ease-in 0s;
        transition: all 600ms ease-in 0s;
    }