diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index e07b369f..294e5d63 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -1945,7 +1945,7 @@
     --input-color: var(--arrowpanel-color, FieldText);
   }
   /*== Sidebar - Field Color ===================================================*/
-  html[lwt-sidebar] body {
+  html[lwt-sidebar]:not(#main-window) body {
     background-color: var(--lwt-sidebar-background-color, Field) !important;
     color: var(--lwt-sidebar-text-color, FieldText) !important;
   }
@@ -15210,7 +15210,7 @@
   }
 }
 @media (-moz-bool-pref: "userChrome.theme.fully_color") {
-  html[lwt-sidebar] body {
+  html[lwt-sidebar]:not(#main-window) body {
     background-color: var(--lwt-sidebar-background-color, Field) !important;
     color: var(--lwt-sidebar-text-color, FieldText) !important;
   }
diff --git a/css/leptonChromeESR.css b/css/leptonChromeESR.css
index f300f2de..9e0e4f48 100644
--- a/css/leptonChromeESR.css
+++ b/css/leptonChromeESR.css
@@ -2169,7 +2169,7 @@
     --input-color: var(--arrowpanel-color, FieldText);
   }
   /*== Sidebar - Field Color ===================================================*/
-  html[lwt-sidebar] body {
+  html[lwt-sidebar]:not(#main-window) body {
     background-color: var(--lwt-sidebar-background-color, Field) !important;
     color: var(--lwt-sidebar-text-color, FieldText) !important;
   }
diff --git a/src/theme/_fully_color.scss b/src/theme/_fully_color.scss
index 503bd828..7be2d911 100644
--- a/src/theme/_fully_color.scss
+++ b/src/theme/_fully_color.scss
@@ -182,7 +182,7 @@ html|button.ghost-button:not(.semi-transparent):enabled:hover:active {
 }
 
 /*== Sidebar - Field Color ===================================================*/
-html[lwt-sidebar] body {
+html[lwt-sidebar]:not(#main-window) body {
   background-color: var(--lwt-sidebar-background-color, Field) !important;
   color: var(--lwt-sidebar-text-color, FieldText) !important;
 }