How to fill the entire width (React.js)?
<p>i'm new to React.js and the first thing i noted is that the entire width of the page is not filled. This is my JS code:</p>

<pre><code>var Navbar = React.createClass({
    render: function(){
        return(
            &lt;div className="navbar"&gt; &lt;/div&gt;
        );
    }
});

ReactDOM.render( &lt;Navbar/&gt;,document.getElementById('test') );
</code></pre>

<p>And CSS:</p>

<pre><code>.navbar{
    background-color: green;
    width: 100%;
    height: 3em;
}
</code></pre>

<p>There is a 3px top, left, right unexpected margin.</p>