Background color Menu and bottom page

I have been having difficulties change the color on the top of my sub-pages. The main page has the correct color (black), but if I go to a sub-page, the color is different (dark blue/purple) i tried to change my heading color to the same color, but this only resulted in the color changing again to a different tone. So it is some dependency between the heading color and the color below. 

Any fix? I can't find any way to change it. The correct color on the main-page kan be seen her:  www.lederutvikling.online/index.php
The sub-page colouring can be seen her:  www.lederutvikling.online/index.php/vanlige-problemstillinger2
 

Hello,

Please edit file /media/templates/site/coworking/css/custom.css and around line 240 change this:

to this:

Regards,
Milos

Thank you, that worked!