Hi Glenys, Martin, and all,
There are two ways to use my css3_Facelift in HotPot and Moodle:
1: generate the .htm file with the css3_Facelift locally on your computer and upload it to HotPot in Moodle the usual way.
2: log in through FTP to your moodle, find moodle/mod/hotpot/attempt/hp/6/templates/hp6.cs_ file and replace it with the css3_Facelift hp6.cs_ . This way, if you upload say .jcl or any of the other source files, you'll also get the rounded corners and dropshades.
Thanks for the interest in the add-ons and the css3_Facelift.
BTW, there are also css3 facelifts for TextToys and Quandary.