JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
    <div class="panel left"></div>
    <div class="panel right"></div>
</div>

CSS

.wrap {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 100px auto;
}

.panel {
    position: absolute;
    z-index: 1;
    top: 0;
    width: 100px;
    height: 200px;
    transition: 0.3s linear;
}
    
.left {
    background: url(http://placekitten.com/200/200)  left top no-repeat;
    left: 0;
}

.left.slide {
    left: -100px;
    width: 200px;
}

.right {
    right: 0;
    background: url(http://placekitten.com/230/200)  right top no-repeat;
}

.right.slide {
    right: -100px;
    width: 200px;
}

JavaScript

jQuery('.left,.right').mouseenter(function(){
    jQuery(this).addClass('slide');
});