diff --git a/containers/libreportal/frontend/core/forms/css/config.css b/containers/libreportal/frontend/core/forms/css/config.css
index 187bb79..2bc77f2 100644
--- a/containers/libreportal/frontend/core/forms/css/config.css
+++ b/containers/libreportal/frontend/core/forms/css/config.css
@@ -268,9 +268,19 @@
 /* Boxed content panel for a config section's body (the area after the divider,
    before any action buttons). A darker inset inside the section card so the
    options read as their own content section — matches the boxed look used
-   elsewhere. Applies to regular option grids and the block editors
-   (domains/catalog/whitelist). Scoped to the main config editor (not app-config). */
+   elsewhere. Covers regular option grids (.config-fields); the master-toggle
+   control row of a gated section (the enable checkbox / install-mode select sits
+   in its OWN wrapper, a sibling of .config-fields, so without this it was the one
+   part of the section body left unboxed — e.g. Mail Enabled, Installation Mode);
+   and the block editors (domains/catalog/whitelist). The toggle wrappers are
+   element-qualified to the <div> because renderToggleSection puts the same class
+   on the inner .checkbox-label pill too, which must not get its own box. Scoped
+   to the main config editor (not app-config). */
 .config-category:not(.app-config) .config-fields,
+.config-category:not(.app-config) div.mail-master-toggle,
+.config-category:not(.app-config) div.git-master-toggle,
+.config-category:not(.app-config) div.generic-master-toggle,
+.config-category:not(.app-config) div.backup-remote-toggle,
 .config-category:not(.app-config) .domain-building-blocks,
 .config-category:not(.app-config) .whitelist-building-blocks {
   background: rgba(0, 0, 0, 0.20);