JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="hover">Hover over me. Change my parent.</div>
    <div class="overlay"></div>
</div>

CSS

.container {
    background: lavender;
    position: relative;
    width: 600px;
    height: 400px;
    border: 1px solid black;
}  
.overlay {
    width:100%;
    height:100%;    
}

.hover {
    background: lightblue;
    width: 200px;
    height: 200px;
    position: absolute;
    left: 0;
    top: 0;
}
.hover:hover ~ .overlay {
    background: seagreen;
}

JavaScript

//Faking parent selector behavior using pure CSS