added a new problem to be solved with selector combination
a first solution is to have in only one place the duplicated padding
added a new problem to be solved with shorthand stile
refactored the css property to use shorthand
first problem to be solved with inline property
solved problem adding a display inline and margin to nav element
changed to use top right&left bottom pattern
added a new problem
fixed using margin 0 auto
Merge pull request #8 from helmedeiros/grooming-your-code

Finished learning about CSS DRY, display and centering strategies