diff --git a/alternative_user_files/userContent_no_addons.css b/alternative_user_files/userContent_no_addons.css
index a565fd8..91b9a17 100644
--- a/alternative_user_files/userContent_no_addons.css
+++ b/alternative_user_files/userContent_no_addons.css
@@ -918,6 +918,11 @@ url-prefix(https://discovery.addons.mozilla.org) {
     box-shadow: inset 0 -3px 0 0 var(--in-content-primary-button-background-hover)!important
   }
 }
+@-moz-document url-prefix(about:blank) {
+  html {
+    background: var(--in-content-page-background)!important
+  }
+}
 @-moz-document url-prefix(chrome://) {
   #ColorsDialogPane,
   #ConnectionsDialogPane,
diff --git a/css/userContent-files/about_pages.css b/css/userContent-files/about_pages.css
index c13eed8..905bd36 100644
--- a/css/userContent-files/about_pages.css
+++ b/css/userContent-files/about_pages.css
@@ -414,6 +414,11 @@ url-prefix(https://discovery.addons.mozilla.org) {
     box-shadow: inset 0 -3px 0 0 var(--in-content-primary-button-background-hover)!important
   }
 }
+@-moz-document url-prefix(about:blank) {
+  html {
+    background: var(--in-content-page-background)!important
+  }
+}
 @-moz-document url-prefix(chrome://) {
   #ColorsDialogPane,
   #ConnectionsDialogPane,
diff --git a/userContent.css b/userContent.css
index e5a06f4..19a3fca 100644
--- a/userContent.css
+++ b/userContent.css
@@ -918,6 +918,11 @@ url-prefix(https://discovery.addons.mozilla.org) {
     box-shadow: inset 0 -3px 0 0 var(--in-content-primary-button-background-hover)!important
   }
 }
+@-moz-document url-prefix(about:blank) {
+  html {
+    background: var(--in-content-page-background)!important
+  }
+}
 @-moz-document url-prefix(chrome://) {
   #ColorsDialogPane,
   #ConnectionsDialogPane,