JSFiddle - React, Tailwind, and code Playground

HTML

<div class="test"></div>

CSS

.test {
    position: relative;
    width: 450px;
    height: 300px;
    background-image: url(http://tseyor.org/images/sello-grande.png?thumb=300x200);
    background-size: cover;
}


.test:after {
    content: "";
    position: absolute;
    top: 0px;
    right: 0px;
    bottom: 0px;
    left: 90px;
    background-image: url(http://tseyor.org/images/sello-grande.png?thumb=600x400);
    background-size: cover;
    -webkit-transition: opacity 1s;
    -moz-transition: opacity 1s;
    transition: opacity 1s;
    opacity: 0;
}

.test:hover:after {
    opacity: 1;
}