Fix visual issues
Since launch we're gotten a good amount of feedback from users. This issue will be a collection of the small changes needed to make our UI more consistent and user friendly.
- Clicking the search box gives a green validation color. It should only turn green when a course section is found from the search
- Clicking the search button turns the entire search button white
- The close button should have the same height as the "Your Schedule" header
- Search should only be allowed when the search term is not empty
- Add some sort of animation/effect that indicates that a course section was successfully added to the schedule