Update modal/popover box shadows to match design
Adjust font size/spacing for "Share only on" link
Use updated background grain image
Make default continent color transparent
Add grain to modal background overlay
Do not use fade-in on inital choice modal load
Make selected topic choice more obvious
with opacity and a scale transform
Make fontawesome icons smaller in interstitial modal
Merge pull request #46 from sgarrity/polish

Interface polish for Bug 994997
Set height of modal footer dynamically.
Make the footer take up space.
Center the choices dialog vertically.