diff --git a/toolkit/themes/shared/aboutSupport.css b/toolkit/themes/shared/aboutSupport.css
index 69e6a95b46..f868e48a95 100644
--- a/toolkit/themes/shared/aboutSupport.css
+++ b/toolkit/themes/shared/aboutSupport.css
@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 html {
-  --aboutSupport-table-background: #ebebeb;
+  --aboutSupport-table-background: var(--in-content-box-background);
   background-color: var(--in-content-page-background);
 }