JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child">
        
    </div><br>
    <a href="#" class="inc-child">Add one more child</a>
</div><br>
<a href="#" class="inc-parent">Add one more Parent</a>

CSS

a{
    float: left;
    padding: 5px 10px;
    text-decoration: none;
    margin-top: 10px;
    color: #333;
    border-radius: 5px;
    background: #ccc;
}
a:hover{
    color: #fff;
    background: #333;
}
.child{
    width: 100%;
    height: 150px;
    float: left;
    background: orange;
}
.parent{
    width: 500px;
    height: auto;
    padding: 20px;
    float: left;
    background: black;
}