JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">
    <div id="header">
         <h1><b>Website Header</b></h1>

    </div>
    <div id="nav">
        <ul>
            <li><a href="#">Home</a>
            </li>
            <li><a href="#">Forums</a>
            </li>
            <li><a href="#">Members</a>
            </li>
            <li><a href="#">Contact Us</a>
            </li>
        </ul>
    </div>
    <div id="submain">
        <div id="chat">
             <h3>CHAT BOX</h3>

        </div>
        <div id="content">
             <h1>Content goes here</h1>

        </div>
        <div id="subright">
            <div id="members">
                 <h4>Member Area</h4>

            </div>
            <div id="recent">
                 <h4>Recent Activity</h4>

            </div>
        </div>
    </div>
    <div id="footer"> <b>Some footer, 2013</b>

    </div>
</div>

CSS

html, body {
        height: 100%;
        width: 100%;
    }
    body {
        margin: 0;
        padding: 0;
        border: 0;
        font-family: Verdana, Arial, Helvetica, sans-serif;
        font-size: 13px;
        line-height: 15px;
        background: #66FF66;
    }
    img {
        border: none;
    }
    a {
        color: #8D0D19;
    }
    a:hover {
        color: #1A446C;
    }
    #main {
        width:100%;
        overflow:hidden;
        float:left;
        background:red;
    }
    #header {
        height: 150px;
        margin: 10px;
        padding: 5px;
        text-align: left;
        background: #1A446C;
        color: #D4E6F4;
    }
    #header h1 {
        padding: 1em;
        margin: 0;
    }
    #nav {
        text-align:center;
        /*word-spacing:240px;*/
        float: center;
        height: 100%;
        min-width: 1200px;
        margin: 0 auto;
        padding: 1px 0em;
        color: #D4E6F4;
        background: none;
    }
    #nav a {
        color: #D4E6F4;
        text-decoration: none;
    }
    #nav li a:hover {
        background: #383;
    }
    #nav ul li {
        list-style-type: none;
        display: inline;
    }