.b-lazy {
    -webkit-transition: opacity 500ms ease-in-out;
    -moz-transition: opacity 500ms ease-in-out;
    -o-transition: opacity 500ms ease-in-out;
    transition: opacity 500ms ease-in-out;
    max-width: 100%;
    opacity: 0;
}

.b-lazy.b-loaded {
    opacity: 1;
}