I have installed Eclipse Luna and for some reason they have removed the default light colored theme that I\'m familiar with.
You could possibly set the color scheme yourself, I haven't looked very closely into the new eclipse (still use an older version myself), but I found this which might be of help:
http://eclipsecolorthemes.org/?view=theme&id=790
http://eclipsecolorthemes.org/
Otherwise, maybe this answer can be of help:
You can reset to default color scheme in the Window>Preferences options page. This expample will be for resetting a theme usd for Java.
Navagate to Windows>Preferences>Java>Editor. Click on Syntax Coloring. Click "Restore Defaults" and "Apply". Then, navagate to General>Editors. Click on Text Editors. Click on "Restore Defaults" and "Apply".
I had the same issue and the above steps cleared up my problem. Also, the Show line numbers check box is on the last page from above.