shows pixel glitches
The arrow that GuidedTour sometimes draws on guiders has some pixel glitches. In the attachment you can see obvious pixels below the arrow tip , and I think a faint darkening above the arrow.
I think this occurs because CSS "sprites" the arrow heads from the png modules/ext.guidedTour.arrows.png , and in this the pixels from the shadow around one arrowhead bleed into the crop rectangle of the nearby arrowhead.
The fix is to remake the png with a bigger gap between each arrowhead so the shadow pixels don't overlap bounding rectangles, then adjust the CSS.