diff --git a/core/misc/dialog/off-canvas.base.css b/core/misc/dialog/off-canvas.base.css
index 4326f61eed..e70f044ad5 100644
--- a/core/misc/dialog/off-canvas.base.css
+++ b/core/misc/dialog/off-canvas.base.css
@@ -27,7 +27,6 @@
 #drupal-off-canvas .link:focus,
 #drupal-off-canvas a:hover,
 #drupal-off-canvas .link:hover {
-  outline: none;
   color: #46a0f5;
 }
 #drupal-off-canvas hr {
diff --git a/core/misc/dialog/off-canvas.details.css b/core/misc/dialog/off-canvas.details.css
index fcd526f0b0..dcaea5ec10 100644
--- a/core/misc/dialog/off-canvas.details.css
+++ b/core/misc/dialog/off-canvas.details.css
@@ -40,7 +40,6 @@
 #drupal-off-canvas summary:hover,
 #drupal-off-canvas summary:focus {
   background-color: #222;
-  outline: none;
 }
 #drupal-off-canvas details[open] {
   padding-bottom: 10px;
diff --git a/core/themes/stable/css/core/dialog/off-canvas.base.css b/core/themes/stable/css/core/dialog/off-canvas.base.css
index 4eded024b9..6425c39ed4 100644
--- a/core/themes/stable/css/core/dialog/off-canvas.base.css
+++ b/core/themes/stable/css/core/dialog/off-canvas.base.css
@@ -27,7 +27,6 @@
 #drupal-off-canvas .link:focus,
 #drupal-off-canvas a:hover,
 #drupal-off-canvas .link:hover {
-  outline: none;
   color: #46a0f5;
 }
 #drupal-off-canvas hr {
diff --git a/core/themes/stable/css/core/dialog/off-canvas.details.css b/core/themes/stable/css/core/dialog/off-canvas.details.css
index fcd526f0b0..dcaea5ec10 100644
--- a/core/themes/stable/css/core/dialog/off-canvas.details.css
+++ b/core/themes/stable/css/core/dialog/off-canvas.details.css
@@ -40,7 +40,6 @@
 #drupal-off-canvas summary:hover,
 #drupal-off-canvas summary:focus {
   background-color: #222;
-  outline: none;
 }
 #drupal-off-canvas details[open] {
   padding-bottom: 10px;