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! While you're at it, check out some resources Treehouse students have shared here.

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

CSS CSS Basics (2014) Enhancing the Design With CSS Media Query Basics

1 Answer

Steven Parker
Steven Parker
231,236 Points

Percentage ("%") is normally relative to the size of the containing element of the one you apply it to.

On the other hand, ems are relative to the font size in use on the element you apply them to. The name comes from the fact that the capital "M" is used as the basis for the measurement.