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 trial2 Answers

stjarnan
Front End Web Development Techdegree Graduate 56,488 PointsHi Luis!
'#' means ID, so if you have a div in your html with an id of wrapper, you can style it in your css by writing #wrapper.
Example:
<div id="myId">
</div>
Can be selected like this:
#myId {}
I hope that helps!
Jonas
