A feature that was in the original g(Math) that was lost when I migrated over to a WolframCloud deployment was grid lines on a graph. I am pleased to announce that this has returned, thanks to a prompting from Megan Heine. Showing the gridlines is now a default option and it will put gridlines on the xstep and ystep declarations. Uncheck the option at the bottom to return back to no gridlines.