Quicker breaking to mobile menu to prevent multi-level menus on smaller screens for students.
Changed id of user_name to user_id to avoid conflict with Lawrence's new tables. Also tweaked the menu's background a bit. Force content to be 100% height (pushes footer off screen too) to prevent content from being to short and showing menu behind it.
Moved footer into sidebar for mobile. Made transition times (0.25s, 0.35s) into variables in _constants.scss.