JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<body>

<div id="container" style="width:auto">

<div id="header" style="background-color:#FFA500;">
<h1 style="margin-bottom:0;">Main Title of Web Page</h1></div>

<div id="menu" style="">
<b>Menu</b><br>
HTML<br>
CSS<br>
JavaScript</div>

<div id="content" style="background-color:#EEEEEE;height:100%;width:auto;float:left;">
test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content test content </div>

<div id="footer" style="background-color:#FFA500;clear:both;text-align:center;">
Copyright © something</div>

</div>

</body>
</html>

CSS

#menu{
background-color: #FFD700;
height: auto;
width: auto;
float: left;
position: absolute;
}