Change cursor color?

[keforbes]

This was requested on our forums:
https://sourceforge.net/p/vrapper/discussion/901740/thread/cc41091ba6/

@albertdev, do you know if this is possible? From what I've found online, it looks like there's no way to explicitly set the cursor color. I think it's simply the inverse of the background color. However, you've spent some time fixing a couple theming/css issues for vrapper so I thought you might have more details.