Correct CSS 'property: value' spacing.
Merge pull request #121 from charlieegan3/gh-pages

Correct CSS 'property: value' spacing.
Remove excess whitespace from tutorials & examples
Improve Box Model explanation in HTML lesson 3
Merge pull request #122 from charlieegan3/gh-pages

HTML Tutorial Improvments
Use strict equality in code snippet.

The text describes strict equality whereas the code describes ==
Merge pull request #124 from jae2/gh-pages

Typo - use strict equality in code snippet.