 a file called <code>styles.css</code> and include it in the <code>index.html</code> file:</p>
<pre><code class="lang-markup">&lt;!doctype html&gt;
&lt;html&gt;
    &lt;head&gt;
        &lt;meta charset=&quot;utf-8&quot; /&gt;
        &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1&quot; /&gt;
        &lt;title&gt;My Application&lt;/title&gt;
        &lt;link href=&quot;styles.css&quot; rel=&quot;stylesheet&quot; /&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;scrip