.lazy-container {
    width: 100%;
    height: auto;
    display: none;
}

    .lazy-container img.lazy {
        display: none;
    }

    .lazy-container.image-loaded {
        display: block;
    }

    .lazy-container img.lazy.loaded {
        display: block;
    }

img.lazy {
    opacity: 0;
    transition: opacity .3s ease;
}

    img.lazy.loaded {
        opacity: 1;
    }