Fix up some CSS, and some other minor details.
Fix up some CSS, and some other minor details.

thomasjm/MathJax,wikimedia/MathJax,jinntrance/mathjax,GerHobbelt/MathJax,thomasjm/MathJax,thomasjm/MathJax,thomasjm/MathJax,thomasjm/MathJax,GerHobbelt/MathJax,dpvc/MathJax,jinntrance/mathjax