JSFiddle - React, Tailwind, and code Playground

HTML

<div class="numbers">12345</div>
<div class="numbers">12345</div>
<div class="numbers">12345</div>

CSS

span{ color: red}

JavaScript

$('.numbers').each(function (index) {
    var characters = $(this).text().split("");
    
    $this = $(this);
    $this.empty();
    $.each(characters, function (i, el) {
    $this.append("<span>" + el + "</span");
    });

});