Created attachment 1090873 [details] Screenshot of a GTK3 tooltip in GNOME 3.19.1 Description of problem: In the current Fedora development tree, tooltip labels of GTK3 based applications are unreadable because the font colour is dark grey while the background colour is black. Version-Release number of selected component (if applicable): gtk3-3.19.1-1.fc24 How reproducible: Always Steps to Reproduce: 1. Launch the file browser. 2. Hover the mouse pointer over the directory tree. Actual results: Tooltip labels are unreadable. Expected results: Tooltip labels are readable. Additional info: Issue appeared with the GNOME 3.19.1 stack; in Fedora 23 with GNOME 3.18.x, the text colour of tooltips is white and the background colour is black making them perfectly readable.