For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
Hugh Messenger said:If it's big, fat and stupid you want ... you came to the right place.
Try your template.css file, in ./views/form/tmp/whatever (where whatever is your template name).
-- hugh
Hugh Messenger said:BTW, I'm not ignoring your 2.0 related posts ... well, I kind of am, LOL! I leave that stuff to Rob, I'm not yet really doing much active work on 2.0. I'll join in the 2.0 fun when it reaches Beta.