JSFiddle - React, Tailwind, and code Playground

HTML

<div class="case__grid">1</div>
<div class="case__grid">2</div>
<div class="case__grid">3</div>
<div class="case__grid">4</div>
<div class="case__grid">5</div>

JavaScript

$(".case__grid").each(function() {
    var elem = $(this);
    
    setInterval(function(){
        caseAnimation(elem);
    }, 3000);
});

function caseAnimation(elem) {
	elem.css('background', 'red');
}