diff --git a/apps/server/src/assets/views/desktop.ejs b/apps/server/src/assets/views/desktop.ejs
index 8d53b914c..4a4b59436 100644
--- a/apps/server/src/assets/views/desktop.ejs
+++ b/apps/server/src/assets/views/desktop.ejs
@@ -12,7 +12,7 @@
 </head>
 <body
   id="trilium-app"
-  class="desktop heading-style-<%= headingStyle %> layout-<%= layoutOrientation %> platform-<%= platform %> <%= isElectron ? 'electron' : '' %> <%= hasNativeTitleBar ? 'native-titlebar' : '' %> <%= hasBackgroundEffects ? 'background-effects' : '' %>"
+  class="desktop heading-style-<%= headingStyle %> layout-<%= layoutOrientation %> platform-<%= platform %> <%= isElectron ? 'electron' : '' %> <%= hasNativeTitleBar ? 'native-titlebar' : '' %> <%= hasBackgroundEffects ? 'background-effects' : '' %> <%= isMainWindow ? '' : 'extra-window' %>""
   lang="<%= currentLocale.id %>" dir="<%= currentLocale.rtl ? 'rtl' : 'ltr' %>"
 >
 <noscript><%= t("javascript-required") %></noscript>
