web todo: styling nitpicks

[michaelbjames]

[ ] - Syntax highlighting uses a slightly off-white background color. I see two options to fix this:

• Download the current styling sheet and modify it. https://highlightjs.org/static/demo/styles/github.css
• Find a different style with a white bg: https://highlightjs.org/static/demo/ Then edit the index.html file to use that style sheet instead.