JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrap">
    <div id="content">hello</div>
</div>

CSS

html,body{
    height:100%;
}

#wrap{
    background-color:red;
    width:100%;
    height:100%;
    box-sizing:border-box;
    padding:2.5% 5%;
}

#content{
    background-color:cyan;
    height:100%;
}