JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
         <div id="sidebar" class="column large-2 medium-3">
             <div class="row">
               test
             </div>
         </div>
         <div id="rightside" class="column large-10 medium-9">
             <a>sdas</a>
             <div class="row">test2</div>
         </div>
    </div>

CSS

#rightside div:first-of-type {
    background-color: red;
    

}