<html>
    <body>
        <div id="app"></div>
        <script src="http://fb.me/react-0.9.0.js"></script>
        <script src="out/goog/base.js" type="text/javascript"></script>
        <script src="om_sente.js" type="text/javascript"></script>
        <script type="text/javascript">goog.require("om_sente.core");</script>
    </body>
</html>

<html>
    <body>
        <div id="app" style="width: 100%"></div>
        <script src="http://fb.me/react-0.9.0.js"></script>
        <script src="out/goog/base.js" type="text/javascript"></script>
        <script src="om_sente.js" type="text/javascript"></script>
        <script type="text/javascript">goog.require("om_sente.core");</script>
    </body>
</html>

Add width 100% to app div.
Add width 100% to app div.
