.rosaly-full-image-wrapper {
    position: relative;
    display: block;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
}
.rosaly-full-image-wrapper img {
    width: 100%;
    display: block;
    transition: opacity 0.4s ease;
}
.rosaly-full-image-wrapper img.second-image {
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    z-index: 2;
}
.rosaly-full-image-wrapper:hover img.second-image {
    opacity: 1;
}