.fade-in {
    animation-name: fadeIn;
    animation-duration: 1.3s;
    animation-timing-function: cubic-bezier(0, 0, 0.4, 1);
    animation-fill-mode: forwards;
}
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}
img.lazy-load:not([src]):after {
    content: "Bild '" attr(alt) "' wird geladen";
}