Two ways to use ‘conditional’ CSS: depending on the browser being used; and changing the look of a Thank You page depending on form results.
Moderate difficulty, requires some PHP and CSS
This How-to document links to the recipe ‘Adding your own CSS styling’ in Chapter 3 of the “ChronoForms 3.1 for Joomla! sites cookbook”.
Important: This document was written for ChronoForms v3 on Joomla! 1.5; it may be possible to adapt the contents to ChronoForms v4 and/or Joomla! 1.6 but this has not been tested.