Within the UI customization toolkit there is a custom.css file to apply changes to various aspects of the UI.
I apologize if I state the obvious but... There are(or rather, there may be) numerous custom.css Files to modify numerous iw.css Files.The one you are looking for should be placed in this folder:iw-home/local/config/lib/content_center/customer_src/web/formspub/styles/custom.cssAfter modifications you'll have to run make_toolkit Widget to apply it all.HTH
Sorry I was unclear. That is the file I was modifying. I should have stated that in my original post. I have opened a support incident for this as clearly, that style element is ignoring any width setting that is applied. It may just be that the width of the tooltip popup cannot be changed.
Have you tried to modify something that is clearly in the class (width isn't)? For example, make background-color: #75548F; and see if it changes, etc... Floating box size may or may not be set with CSS, if it is it can be another class entirely with some obscure name