styling update 

Addresses '1' from https://github.com/ZendeskES/out-of-office-app/issues/120 partially. Still needs: *get filter arrows to render properly*
Addresses '2' from https://github.com/ZendeskES/out-of-office-app/issues/83 (Referenced again in https://github.com/ZendeskES/out-of-office-app/issues/120) partially. Still needs: *sidebar toggles in admin interface* & *the entire issue from https://github.com/ZendeskES/out-of-office-app/issues/111 (re: 'make buttons in sidebars(user, new_ticket, ticket) full width of container for NON-ADMINS')*
DOES NOT address '3' from https://github.com/ZendeskES/out-of-office-app/issues/120