Adjust font size Safari sidebar Mojave

Thanks for the answers above. As an update, in Mavericks 10.9, the file is still Main.css and can now be found at the following path:

/System/Library/PrivateFrameworks/WebInspectorUI.framework/Versions/A/Resources

You may also find the file using following terminal command:

find /System/Library/PrivateFrameworks -name Main.css

As far as the difference in versions of outlook, MS actually has an official statement about that:

http://support.microsoft.com/kb/2783553

Summary

Email messages that are sent from Microsoft Outlook for Mac 2011 to other operating systems may have with a different font size than the original email message font size. For example, when text that has Calibri font size 14 is sent from Outlook for Mac 2011 to Microsoft Outlook or Outlook Web App, the text may be displayed as a font size other than 14 when the message is received on the other operating system.

More information

This is caused by the pixel-to-point or point-to-pixel conversion that happens between the Mac and Windows operating systems.

In other words they're using points in OSX and pixels in Windows.