Very good. Thank you so much. ANd did this alter the backend as well? It look so COOOOOOOL now! :-)

Yes, it was me too :]

So very cool - what did you do? Because this is "just" my staging site and I want it on my productive site as well ;-)

Use the same file : /media/templates/administrator/atum/css/user.css

it's custom css for admin theme, and works even after Joomla update

Really nice of you. Thank you very much :-)

If you have many sites that you manage it's better to see in second what site is that. Logo colors help with that.