CSS cleanup
let the scopes UL overflow
float scopes to the right when they overflow

IMO this looks much better than having them overflow directly beneath
the Batch Actions button
brings back the resource mismatch error

resolves #2728
Merge pull request #2746 from seanlinsley/ui/2743-scope-overflow

Properly handle index scopes overflow
Fix for box-shadow deprecation warning
Merge pull request #2760 from arturtr/patch-1

Fix for box-shadow deprecation warning