A way to add a class to all form fields?

[Shpigford]

I'm trying to add flex-grow to all form inputs to get the form fields to take up the full width of the page. Is the only way to do that to copy over all the views and then edit each one?

Essentially trying to do this:

If so, no sweat. But if that is the case, thoughts on me doing a PR to go ahead and add flex-grow to the default templating so the forms are a bit more usable?