diff --git a/core/modules/outside_in/css/offcanvas.css b/core/modules/outside_in/css/offcanvas.css
index a85b354..c4d387c 100644
--- a/core/modules/outside_in/css/offcanvas.css
+++ b/core/modules/outside_in/css/offcanvas.css
@@ -33,11 +33,11 @@
   padding: 15px;
 }
 
-#page.offCanvasDisplayInProgress {
+#canvas-tray.offCanvasDisplayInProgress {
   position: fixed;
   display: inline-block;
 }
 
-#page.offCanvasDisplayed {
+#canvas-tray.offCanvasDisplayed {
   display: inline-block;
 }