User blog comment:Kirkburn/Syntax highlighting - helping you read and write code/@comment-11842624-20150309185039/@comment-126761-20150309192725

Yeah, we want to make sure the colours don't make it harder to read the text - they should be useful hints in the background. The light theme colours will be toned down in this week's Wednesday release.

I am not quite sure what you're referring to with the second question - can you be more specific?