Welcome the Technical Support section. Help us in assisting you by providing us with a concise and descriptive elaboration of your issues. Be specific and if possible, provide us with a step-by-step instruction in replicating your problem.
How can I customize, change the colors, Jomsocial modules?
Your css suffix is not working because already be overriden by the css from you joomla template, please you contact kronos template developer for this issue.