Yes. I made the mistake of expecting you to understand what this means:
A reference to a Text Object (which is what you’re trying to use) is not a CSS selector.
You can use the browser’s DevTools to help you build a selector.
It will be a string which might look something like this:
div.someclass textarea.anotherclass
If you’re lucky, it might have an id something like…
#expressions-text
If you have trouble, post your HTML showing that textarea and I’ll try to make one for you.