Thanks for your message. I would like to add more styles, but at the moment I would like to fix the errors first. If you have any time, you can create a style:
Take a look into the "layout.css" in the plugin dir. Disable the "main css" in the plugin options and now you can add your own css style. IMHO I would like to create a style which can be created by CSS only, so every user can set up an own style globally, but I think it is more flexible if the user can set a CSS class for a code block, because each code block can be get its own CSS style and the user can defined this styles in the theme CSS files and I can push different styles to plugin CSS.
Thanks :-) I will write it to my to do list