Make the player sticky

[absempere]

On the event page, make the player sticky so that when annotations scroll, the player remains visible.

[absempere]

The stickiness works great, but the buttons for hiding tags & stopping auto-scroll get covered when the annotations scroll far enough. Can we make the player stick a little higher on the page so the user can still see and use those buttons?

[ajolipa]

Will do -- I should have tested at more screen sizes; I tried to make it so they didn't overlap, but clearly failed! Should be a quick fix.