JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head>
        <title>index</title>
        <link href="ArticleStyleSheet.css" rel="stylesheet" type="text/css" />
    </head>
    <body>
        <div id="wrapper">
            <header>
                Header
            </header>
            <div id="articleContainer">

                <div id="articleContent" contenteditable>
                    The quick brown fox jumped over the lazy dogs back. All good men must come to the aid of the party
                </div>

                <div id="articleSidebar">
                    Article Sidebar
                </div>
            </div>
        </div>
    </body>
</html>

CSS

html, body
{
    padding: 0;
    margin: 0;
    height: 100%;
}

#wrapper
{
    display: -webkit-flex;
    -webkit-flex-direction: column;
    min-height: 100%;
    background-color: purple;
    width: 100%;
    margin-top: 0px;
}

header
{
    width: 100%;
    height: 80px;
    background-color: black;
    color: white;
}

#articleContainer {
    width: 75%;
    margin: auto;
    background-color: blue;
    display: -webkit-flex;
    -webkit-flex: 1;
}

#articleContent
{
    width: 70%;
    background-color: yellow;
}

#articleSideBar
{
    position: relative;
    width: 28%;
    background-color: green;
    margin-left: 2px;
    margin-right: 2px;
    display: inline;
    margin-top: 0px;
    height: auto;
}