Unify box shadows for all dropdown menus; use a flexible width for the color scheme picker so it works on mobile devices; and apply a z-index to thecolor picker dropdown so that form fields below don't appear on top of it.

git-svn-id: https://plugins.svn.wordpress.org/mp6/trunk@800663 b8457f37-d9ea-0310-8a92-e5e31aec5664