title: how to add a CSS class using a Macro expression?
body: <p>I need help setting up a CSS drop-down using macro. I created a new field, and under the data type I selected the dropdown. now back under transformation i paste the new field inside the class selector, but i dont see any of the class names i typed under form control.</p>
  <pre><code>   &lt;div class=&quot;alert {% AlertCssBackground %}&quot; &gt; &lt;div&gt;
  </code></pre>