only show vibrancy on MacOS (#8462)

apps/web/styles/globals.css

@@ -166,16 +166,16 @@ html.todesktop aside {
   margin: 0px -6px;
 }
 
-html.todesktop .desktop-transparent{
+html.todesktop-platform-darwin .desktop-transparent{
   background: transparent !important;
   border: none !important;
 }
 
-html.todesktop.dark main.bg-default{
+html.todesktop-platform-darwin.dark main.bg-default{
   background: rgba(0,0,0,0.6) !important
 }
 
-html.todesktop.light main.bg-default{
+html.todesktop-platform-darwin.light main.bg-default{
   background: rgba(255,255,255,0.8) !important
 }