Oh, the CSS problem I was having on littleghost.com: Turns out that the solution is to drop an .htaccess file in the Web root, specifying that MIME type.
While not elegant, this did solve the problem. Still can’t believe that CSS is not set as a global MIME type, but whatever.
The note to me from XO did not really spell out the issue; fortunately I know what an .htaccess file is and to put it in the root (rather than in the /css directory) to make it global. Again, what if I were a newbie?