JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div_1">

    <span class="number">123</span>

</div>

<div id="div_2">
    
    <span class="number">456</span>
    
</div>

CSS

div span{font-size:50px;font-weight:bold;}

JavaScript

$('div .number').each(function(){
    var number = $(this).text();
    var i = 0;
    
    $(this).parent().prepend($("<span class='nNumber'></span>"));
    while(i<number.length)
    {
        $(this).closest('span').hide();
        var nChar = number.charAt(i);  
        i++;
        $('.nNumber').append('<span class="digit-'+nChar+'">'+nChar.split(" ").join(", ")+'</span>');
    }
});