JSFiddle - React, Tailwind, and code Playground

HTML

<div id="menubar">asasas</div>
<div id="content">asasas</div>

CSS

body, html {
color: #000000;
font-family: 'Open Sans', sans-serif;
font-size:12pt;
background:#f2f2f2;
padding:0;
margin:0;
height:100%;
width:100%;
}

#menubar {
position:absolute;
top:0px;
background:#FDBB30;
height:80px;
width:100%;
font-weight:bold;
}

#content {
position:absolute;
top:80px;
width:92%;
left:50px;
background:#ffffff;
height:calc(100% - 80px);
}