Issue #2976287 by amateescu, andrewmacpherson: The off-canvas dialog should...

Issue #2976287 by amateescu, andrewmacpherson: The off-canvas dialog should have a 1px transparent border

core/misc/dialog/off-canvas.theme.css

@@ -6,7 +6,6 @@
 /* Style the dialog-off-canvas container. */
 .ui-dialog.ui-dialog-off-canvas {
   background: #444;
-  border: 0 solid transparent;
   border-radius: 0;
   box-shadow: 0 0 4px 2px rgba(0, 0, 0, 0.3333);
   padding: 0;
@@ -14,6 +13,9 @@
   /* Layer the dialog just under the toolbar. */
   z-index: 501;
 }
+.ui-widget.ui-dialog.ui-dialog-off-canvas {
+  border: 1px solid transparent;
+}
 
 /* Style the off-canvas dialog header. */
 .ui-dialog.ui-dialog-off-canvas .ui-dialog-titlebar {

core/themes/stable/css/core/dialog/off-canvas.theme.css

@@ -6,7 +6,6 @@
 /* Style the dialog-off-canvas container. */
 .ui-dialog.ui-dialog-off-canvas {
   background: #444;
-  border: 0 solid transparent;
   border-radius: 0;
   box-shadow: 0 0 4px 2px rgba(0, 0, 0, 0.3333);
   padding: 0;
@@ -14,6 +13,9 @@
   /* Layer the dialog just under the toolbar. */
   z-index: 501;
 }
+.ui-widget.ui-dialog.ui-dialog-off-canvas {
+  border: 1px solid transparent;
+}
 
 /* Style the off-canvas dialog header. */
 .ui-dialog.ui-dialog-off-canvas .ui-dialog-titlebar {