Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.Start your free trial
katharine horlick2,146 Points
why is the background size 20px 20px
why is the background size 20px 20px rather than just 20px
Erik Nuber20,629 Points
There isn't a particular reason, saying it with just one 20px would have the same effect.
Alex Ginns6,509 Points
Writing both statements would have the same effect, but it's good practice to do both width and height