.images-compare-before img {
    width: 100%;
    height: 80vh;
    display: block;
    background: url("../images/Sliders/Esfericas.jpg") center center no-repeat;
    background-size: cover;
}

.images-compare-after img {
    width: 100%;
    height: 80vh;
    display: block;
    background: url("../images/Sliders/Asfericas.jpg") center center no-repeat;
    background-size: cover;
}