Very nice interface! Two minor suggestions. (1) when you enable "blackboard mode", the cursor should become white. As it is, the cursor is very hard to see on

Very nice interface! Two minor suggestions. (1) when you enable "blackboard mode", the cursor should become white. As it is, the cursor is very hard to see on the blackboard. (2) it honestly took me a while to figure out that you can share just by sharing the link. Maybe make that clearer somehow?