Steps to replicate

1. On an iPhone 5, navigate to the Typography page and expand the default typography pairings accordion.
2. Scroll down until you see the example of paragraph body copy.
3. Note that the forced line breaks cause the example to wrap erratically.

Expected behavior
Forced line breaks don't work well with responsive design, I would expect the paragraphs to wrap naturally according to the screen width.

Tested in
iPhone 5 simulator (Chrome dev tools)