Feature Request: alpha transparency to hex color values

[InternetJohnny]

Pretty small detail, but it would be nice to be able to add transparency to <BackgroundColor> to give the tooltips that extra touch of beauty.

Great work on this project by the way 👌

ps: i didnt want to create a new issue just for this, but the tooltips also have a bit of empty space on the bottom and right hand side, is there any way that you could center the text in the tooltip area?
https://imgur.com/a/XwMFr

[anxxx]

Could I second the request for adding transparency to the background colour or simply the option to turn off the background. I'd love to have just the desktop number show with no background.

Otherwise as I have said before a fantastic app.