JSFiddle - React, Tailwind, and code Playground

HTML

<div class="uXX u1">u1</div>
<div class="uXX u13">u13</div>
<div class="uXX u13">u13</div>
<div class="uXX u16">u16</div>

CSS

.bg {
    background-color: green;
}

JavaScript

$('.uXX').hover(function() {
    $('[class="'+$(this).attr('class')+'"]').addClass('bg');
}, function() {
    $('[class="'+$(this).attr('class')+'"]').removeClass('bg');
});