Sponsorships and Speakers are working and looking pretty well. Other general clean up.

src/app.postcss

@@ -43,6 +43,10 @@ body {
     opacity: .5;
 }
 
+.ae_d_none {
+    display: none;
+}
+
 /* Allow content to scroll horizontal if too wide */
 .ae_h_scrollfix {
     max-width: 100%;
@@ -61,4 +65,14 @@ body {
 
 #appShell #shell-header.iframe {
     display: none;
-}
+}
+
+/* body[data-theme='wintry']  {
+    background: none;
+    background-image: none;
+} */
+
+body[data-theme]:has(#page.iframe) {
+    background: none;
+    background-image: none;
+}