diff --git a/core/modules/workspaces/css/workspaces.toolbar.css b/core/modules/workspaces/css/workspaces.toolbar.css
index 2fcd6a04d1..0c532edd80 100644
--- a/core/modules/workspaces/css/workspaces.toolbar.css
+++ b/core/modules/workspaces/css/workspaces.toolbar.css
@@ -236,6 +236,7 @@
 
 @media all and (min-width: 767px) {
   #drupal-off-canvas .active-workspace {
+    box-sizing: content-box;
     position: fixed;
     top: 0;
     right: 0;
@@ -294,4 +295,8 @@
     min-width: 100%;
     max-width: 100%;
   }
+
+  #drupal-off-canvas .active-workspace {
+    position: inherit;
+  }
 }