Mac Chrome virus that inverts colours?
I've come across bugs like these that ended up being intended or unintended side effects of Chrome extensions or flags. Try disabling these first to make sure it's not one of these.


To disable extensions:


Go to chrome://extensions/.
Uncheck Enabled for each enabled extension.
Reload the buggy pages.

To disable flags (developer options):


Go to chrome://flags/.
Click Reset all to default on the right.
Click Relaunch now at the bottom of the page.



Disable these one by one until the problem goes away, so that you can not only fix the problem bug but also figure out what caused it in the first place.