JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div class="namebox">found me</div>
</div>

<div>
<div>
    <input type="button" id="btn" value="click"/>
</div>

</div>

JavaScript

$(document).ready(function(){
   
   
    $('#btn').click(function(){
       
       
        var text = $(this).parent().parent().siblings(':eq(0)').find('.namebox').text();
        $(this).parent().parent().siblings(':eq(0)').find('.namebox').css("background-color", "yellow");
        alert(text);
    });
    
});