[fvirexi]

[white] as a catchall is a bit misleading. Perhaps a different border color or an asterisk inside the square to clearly mark that it's not an actual white block?

[sharkdp]

Good idea! I will try both and see what works best. Thank you!

[jessaustin]

I would suggest just white (or whatever the background color happens to be), with a dashed border.

[jessaustin]

Now that I've seen the update, I think just make it transparent, so it is the color of the button on which it is placed. The dashed border is nice though.

[sharkdp]

Thanks for the feedback! The dashed border was a really good suggestion. I like white better than 'transparent', though.