JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header">#header</div>
<div id="wrapper">
    <div id="leftmenu">#leftmenu</div>
    <div id="content">#content<br />...<br />...<br />...<br />...<br />kfgjdflkgj 
    <div id="cont"></div> #content<br />...<br />.</div>
    <div id="rightmenu">#rightmenu</div>
</div>
<div id="footer">#footer</div>

CSS

html, body {
    margin: 0;
    padding: 0;
}
#header{
    height:90px;
    text-align:center;
    padding: .5em;
    background-color: grey;
    border-bottom: 2px solid black;
}
#wrapper {
    display: table;
    table-layout: fixed;
    width: 100%;
}
#wrapper > div {
    display: table-cell;
}
#leftmenu{
    width:100px;
    font-size: 75%;
    padding:.5em;
    border-right:2px solid black;
    border-left:2px solid black,
}
#rightmenu{
    width:180px;
    font-size: 75%;
    padding:.5em;
    border-left:2px solid black;
    border-right:1px solid black;
}
#content{
    background-color: white;
    margin-left:120px;
    font-size: 80%;
}
#cont{
    background-color: grey;
    margin-left:120px;
    font-size: 80%;
    display: inline-block;
}
#footer{
    height: 70px;
    background-color:white;
    border-top:1px solid black;
    border: 1px solid black;
    padding-top:40px;
    text-align:center;
    font-size: 70%; 
}