For Firefox, I just had to activate:
box-shadow: 0 0 10px #000;
-moz-box-shadow: 0 0 10px #000;
(It was between /* and */ in "Style & configure LAYOUT"-"Layout Container Style") and I got a very nice thin shadow behind the main layout of my site in Firefox and Opera. The problem is Internet Explorer, which doesn't show any shadow. Please help, thanks a lot
PD: Site: www.authenticcontent.com