Forum has different colors on a mac

[El Flow]

Hello,
I am currently having troubles with the colors of my theme on my forum but its only with a macbook i see. Can anyone help me how to fix with weird problems on my theme to get it up and running?   it works fine on windows but not for my mac.

My forum is: musicalforums.net

[effone]

Its possibly be because of the rendering of Safari...
Try and use web-safe colors.

[WallBB]

Another reason might be you are using any extension for dark colors. A rare case.