Incomplete code block on tutorial/step_12

Request Type: docs

How to reproduce: The last code block (app/css/animations.css) of tutorial/step_12 is incomplete.

Component(s): 

Impact: small

Complexity: small

This issue is related to: 

**Detailed Description:**

Go to http://docs.angularjs.org/tutorial/step_12 and scroll to the bottom of the page.

**Other Comments:**

This prevent the page to be truncated (incomplete).