Add class to one cell in header Yii2 GridView
<p>How to add class to only one cell in header in GridView </p>

<p>I need code like this:</p>

<pre><code>&lt;table&gt;&lt;tr&gt;&lt;th&gt;1&lt;/th&gt;&lt;th class="big-border"&gt;2&lt;/th&gt;&lt;th&gt;&lt;/th&gt;&lt;/tr&gt;&lt;/table&gt;
</code></pre>