added font-size to aftwrap to fix #10

Fix for #10.
Most of the changes are deleting random whitespace. The only *actual* changes are to the style section at the bottom tried adding an `!important` to "spreeCon" (feel free to delete) and added a `font-size:36px` to `spreeaftwrap` which actually fixed the problem.
NOTE: I have not minified the javascript (so the fix won't be applied) or repacked the extension as I don't know what minifier you use.
P.S. I'm not completely sure why the site overrode your css properties, have you got any idea about that?