Add a bit of border shadow to entrypoint dialogue

To make it consistent with ULS dialogue style

Change-Id: Ie5e2723af86edeeddd96b3aa069b97f2c9cbe72e
Remove unscoped .hidden class

Use jQuery .hide .show .toggle methods instead

Change-Id: I4bf6e997619593f5e82ad2f376bad4e27fceea36
Merge "Add a bit of border shadow to entrypoint dialogue"