JSFiddle - React, Tailwind, and code Playground

HTML

<div class="welcome">
    <div>
        Hello first child        
        
        <div>
            hello inner child            
        </div>
    </div>
    
</div>


<div class="content">
    <div>
        Hello first child        
        
        <div>
            hello inner child            
        </div>
    </div>
    
</div>

CSS

.welcome div
{
   font-size: 20px;
   border:1px solid blue;
}

.content > div
{
   font-size: 20px;
    border:1px solid red;
}