You’re welcome! I expected so but was being sure. Did you add the styles to the style.css file?
(and actually, sorry @Kuba, do you mean the /api/33/files/style style.css file or do you mean that you upload your own style.css file in the instance and then link it to the form?)
I tried before to use style.css but it wasn’t working I don’t know why: UI Customization (style.css) not taking effect?