First of all, great plugin.
I am having trouble getting changes to the css to update the look of the form. I see that none of the .css files are listed as 'active'. I have made several edits but I cannot seem to effect the look of the form. Specifically, I want to change the font of the usp_label and I do not want a style bullet point for the list, which appears currently as a blue dot. Depending on the arrangement of the Classic/HTML 5 settings I managed to make the bullet point disappear, but I could not change the font. I also tried specifying the .css directly in the settings.
Thanks for your help!