JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child">
        
    </div>
</div>

CSS

.parent
{
    height: 100px;
    width: 100px;
    background-color: red;
}

.child
{
    height: 50px;
    width: 50px;
    background-color: blue;
}

.child:hover .parent
{
    width: 75px;
}