JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
	<div class="item"></div>
</div>

CSS

.wrap {
	width: 250px;
	height: 250px;
	border: solid 1px;
}
.item {
	width: 50px;
	height: 50px;
	border: solid 1px;
}
.wrap:hover .item {
	background-color: #156fff;
}