JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="front"></div>
    <div class="back"></div>
</div>

CSS

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

.parent {
    position: relative;
    width: 100%;
    height: 100%;
}

.parent .front, .parent .back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.parent .front {
    background: red;
    z-index: 1;
}

.parent .back {
    background: blue;
    z-index: 0;
}

.parent:hover .back {
    -webkit-transition: all 0.5s ease;
	-moz-transition: all 0.5s ease;
	-o-transition: all 0.5s ease;
	-ms-transition: all 0.5s ease;
	-khtml-transition: all 0.5s ease;
	transition: all 0.5s ease;
    -webkit-transition-delay: 4s;
    -moz-transition-delay: 4s;
    -ms-transition-delay: 4s;
    -o-transition-delay: 4s;
    transition-delay: 1s; 
    height:30%;
    z-index: 5;
}