Updated stylesheet and javascript files

- Updated `embed.css` so that `#gradient` is smaller and `.info-window`
text takes up less room
- Updated `main.js` so that it calls different infoWindow text depending
on which web page calls it
Resize for 460px wide

Commented out some text, added line breaks, and enlarged top and bottom
boxes.
Add embed button
Fixed link to background image
add embed link and function