Slightly ligthen up the color scheme
Make borders less prominent, and more consistent

Reduces the visual noise and will let us put more focus on the content.
The background color already clearly separates the content boxes from
the page background.
Unbold section headings

This will let us use bold for emphasis at more places, without the
feeling that "everything is bold". Size is already used to give a clear
hierarchy and prominence to the headings.
Clarify heading hierarchy by reducing the size of subheadings