Copy some styles
Copy some styles

Summary: Working my way towards: https://trello.com/c/6t2NOEMd/421-adjust-top-padding-for-math-items, and I don't want to accidentally mess up some alpha styling. First perseus diff! Also wanted to make this a mini-diff to make sure I'm doing this right / not breaking the world!

Test Plan:
make subperseus in this perseus repo
Open up a section and a practice task and see nothing's changed

Reviewers: johnsullivan

Reviewed By: johnsullivan

Subscribers: aria

Differential Revision: https://phabricator.khanacademy.org/D16243

chirilo/perseus,abe4mvp/perseus,learningequality/perseus,daukantas/perseus,alexristich/perseus,chirilo/perseus,sachgits/perseus,ariabuckles/perseus,ariabuckles/perseus,sachgits/perseus,ariabuckles/perseus,iamchenxin/perseus,ariabuckles/perseus,alexristich/perseus,iamchenxin/perseus,daukantas/perseus,learningequality/perseus,abe4mvp/perseus