This is very easy.
Open the software and navigate to Settings / Style Configurator
and from there browse the various Themes on the drop-down menu:
I use the Black board, 3rd from the top, but do you notice the Hello Kitty one?
IT’S PINK! I would never say that this is comfortable for the eyes, quite the opposite but I love it just because it exists and it’s called Hello Kitty 😀