Ok, it’s solved. I did two things and not sure what brought the solution.
First I did find one wrong color code after all in the CSS. Changed this to the right color code and saved the CSS.
Beside that I also installed the ‘SiteOrigin CSS’ plugin which lets you change things like colors in real-time and then makes the desired changes to your CSS. Nice thing about this app is that it makes the changes in a seperate CSS window where it overrules your own CSS. Therefore you can easily throw all the different changes you make with this plugin out whenever you desire without having to go through the complete CSS of your website to find it.
Hope it helps anyone.
