JSFiddle - React, Tailwind, and code Playground

HTML

<div class="img1">

                    </div>
                    <div class="img2">
                        
                    </div>

CSS

.img1, .img2{

  border: 1px solid black;
    transition: 1s;
    position: absolute;
}

.img1{
    left: 25%;
    height: 500px;
    width: 500px;
    z-index: 1;
    background-image: url(http://cdn.pcwallart.com/images/balloons-photography-vintage-wallpaper-1.jpg);
}

.img2{
    right: 25%;
    width: 500px;
    height: 500px;
    bottom: 0;
    z-index: 2;
    background-image:  url(https://i.pinimg.com/736x/c1/7b/15/c17b150e93c4e9c50d963b076484bee7--apple-wallpaper-iphone-wallpaper.jpg);
}

.img1:hover{
    z-index: 999;
}