Teacher view of student screen: Working as expected. Although I think the background should be white and we should shift the content up higher, so we have space for controls along the bottom, e.g. sharing web cam, sharing screen with student 1:1, etc.
Student view of teacher presentation: not working as expected, still small size
Update user detail UI and resize shared screens to fit the entire screen.
Also responding to Enter pressed in the forms (join, create, and course rename).
Fixes #27