JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div id="main-wrapper">
      <header id="main-header">
        <img id="title-image" src="http://i.imgur.com/JaYSY.jpg" />
        <div id="main-navbar">
            STUFF
        </div>
      </header>
    </div>
  </body>

CSS

* {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}

#main-wrapper {
    width: 90%;
    margin: 0 auto;
    border: 3px solid #888;
    margin-top: 20px;
    background: red;
}

#title-image {
    width: 100%;
}

#main-navbar {
    width: 100%;
    background: #333333;
}