Edited mapstyles.css and map.js

* Changed the <h3> on the map page to look like a header with light blue
background.

* Added a border radius to the #map-canvas to give it rounded corners,
and box shadow, to create a shadow around the map n' make it look nicer
hopefully.

* Changed the height of the #map-canvas (container for Google Map) to
the screen height - 100px. Not sure how tall the footer actually is,
hopefully smaller than 100px.