Small CSS tweaks.
Small CSS tweaks.

Mostly visual.

jthoms1/nodeschool.github.io,nodeschool/nodeschool.github.io,denysdovhan/nodeschool.github.io,nodeschool/nodeschool.github.io,denysdovhan/nodeschool.github.io,jthoms1/nodeschool.github.io,denysdovhan/nodeschool.github.io,jthoms1/nodeschool.github.io,nodeschool/nodeschool.github.io