take a look on astridsolcer.nl/botswana
i usede template tp_time and in the page the uitkit switcher
I want to change the color of the headers. Default it is white but it has to be changed.
How to fix it ????

What exactly needs to be adjusted or changed? We need screenshots that clearly show what's being done. Almost anything can be customized with CSS, but only if the desired changes are clearly described.

see the attachment. the text of the headers (under th blue arrows) must change in a other color. Now it is whit but lets say it has to be black.  So do you have css how to change it and info where to put it (maybe in user css?)

there is no attachment.

attachment placed
i selct the file and see it but when sneding it is not showing
 

new try