Are you sure the file has been uploaded? Is that the correct path (case sensitive)?
Going to the blank page is just what they have set up for 404 errors (no page found)...http://www.allislandspeech.com/fake.php goes to the same place.
It could be something in the .htaccess file... if you are sure the page is uploaded and it isn't an issue with case sensitivity, then maybe try deleting the .htaccess file temporarily and see if you can get to the .css file then, that will narrow it down anyway. (of course save a backup of the.htaccess because it might be necessary for your wordpress site to run)