JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main-edit">
    <div id="second" ></div>
</div>

CSS

div#main-edit{
    padding: 6px; 
    color: #555555; 
    background-color: #FFF8F8; 
    border: #dddddd 2px solid;
    width: 350px;
    height: 500px;
    margin-left: 10%;
    margin-right: 10%; 
}

#second {
    background: #aaa;
    height: 100%;
}