JSFiddle - React, Tailwind, and code Playground

HTML

<body> 
    <div id="container">
      <div id="navMenu">
        <div id="header">
                <div id="brand"><a href="index.html">Aspen Development</a></div>
                <ul>
                  <li class="navButton">Home</li>
                  <li class="navButton">Pricing</li>
                  <li class="navButton">Contact Us</li>
                </ul>
        </div>
      </div>
      <div id="content">
        <div id="contentContainer">
        <p><b>4.21.14</b> Welcome to Aspen Development.</p>
        <p><b>4.19.14</b> The website has been created!</p>
        </div>
      </div>
      <div id="footer">
        <center><p style="margin-top: 17px; margin-bottom: 20px; font-size: 0.75em; ">Copyright &copy; 2014 Aspen Development | All Rights Reserved</p></center>
      </div>
    </div>
    </body>

CSS

@charset "utf-8";

body, h1, h2, h3, h4, h5, h6, p, div {
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #FFF;
}

#navMenu, #footer {
    width: 100%;
    width: 1140px; 
    background-color: #F8F8F8;
    border: 2px solid #E6E6E6;
}

#header {
    width: 100%;
    min-width: 1140px; 
    text-align: right;
    overflow:hidden;
}

ul{
    float:right;    
}

#brand {
    float:left;
}


#brand a {
    display: inline-block;
    width: 175px;
    padding-top: 12px;
    padding-bottom: 16px;
    padding-left: 14px;
    padding-right: 14px;
    color: black;
    font-size: 1.25em;
    text-align: justify;
    text-decoration: none;
}


.navButton {
   display:inline-block;
    width: 175px;
    padding-top: 12px;
    padding-bottom: 16px;
    padding-left: 14px;
    padding-right: 14px;
    color: black;
    font-size: 0.75em;
    text-align: justify;
    list-style: none;
}

#content {
    width: 100%;
}

#contentContainer {
    width: 1140px;
    margin: 0 auto;
}

#contentContainer p {
    margin: 20px;