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

Hello, can you please point me to some documentation about root em, I feel a bit confused about how that works.

I feel a bit confused how the rem works in bootstrap, mostly for setting paddings and margins of object. I will also appreciate if you can explain the perspective of design astethics and why they stick to this rule.

1 Answer

Steven Parker
Steven Parker
243,656 Points

The rem unit is the same as the em unit, it just always uses the font-size of the root element as its basis.

This just means that several layers down into the document, you can rely on rem to be relative to the root font size even if the font size has been changed for your element or a parent element that the size would be inherited from.