Change cursor when in gutter

Changing the cursor when it hovers over the gutter area helps users remember that clicking will select the line. I've had this extension for months and forgot all about it. Adding this functionality reminds me when my cursor is in the gutter area that I can select a line just by clicking.

I linked to a simple style sheet that will do this. You can change the cursor if you want, but I picked the one that made the most sense to me out of the available options in CSS.