Stephen style

I created the final UI for the code view! Some notes:
- Pretty much everything is a placeholder. We'll have to get the interactivity in using JavaScript/whatever.
- I dunno how you guys are doing the actual code editing, but yeah there' just placeholder HTML with a LOT of `<br>` tags everywhere.
- I feel like a lot of the CSS is jank and lots of CSS tables are used. Whelp.
- It's actually responsive!

#### Please pull this branch and review it. Let me know if you have any questions about the design or how the HTML/CSS works. Cheers!