Grid Lines Disappear

[colaviola4]

It looks like on Chrome the grid lines on the play board disappear depending on the current zoom level in browser. When I play at the normal zoom level I see no grid, at 110% I only see vertical lines, at 150% I only see horizontal lines and at 250% (so big I cant see the entire game board) I can see the full grid. It might have to do with resolution as well. I'm currently using a 1920 x 1080 resolution. Also, the zoom level compared to visible lines I presented here are inconsistent across different computers.

The next piece area also has this problem and doesn't match up with the play areas grid on some zoom levels, but is less of a problem because when I play this game I don't need that grid.

I'm not sure if the grid is even supposed to be visible at all but I find the full grid the most useful, is there any way you can make it appear more consistently?

Thanks!

(Here are some pictures in order from no zoom, 110%, 150% and 250%)