Add default body font sizing
Add font size for top level heading
Add level 2 header font size
Update font size to 60px
Revert "Update font size to 60px"

This reverts commit 13c7a81028ba90afea9c988ed2d91aeffe2bb363.
Update top level heading size
Update default.css
Add level 3 heading style selector
Revert "Update default.css"

This reverts commit 4bcf5b12fbb16844ce7f7b9eaac9b2853b2613d1.
Revert "Add level 3 heading style selector"

This reverts commit c9b1fd5e097663632bec71a8a612090865f87cd5.
Merge pull request #4 from githubteacher/stylesheet-additions

Add stylesheets and initial selectors for headings