JSFiddle - React, Tailwind, and code Playground

HTML

<div class="form">
    <input type="text" /><br />
    <input type="text" />
</div>
<p class="congrats"></p>

CSS

p.congrats{display:none;}

JavaScript

$(document).ready(function(){
    $('.form:input').each(function(){ 
        if( $(this).val() != "" ) { 
            $('.congrats').css("display","block"); 
        } 
    });
});