Issue #3215517 by Gauravmahlawat, sagarchauhan, jeremyvii, bkosborne:...

Issue #3215517 by Gauravmahlawat, sagarchauhan, jeremyvii, bkosborne: Multi-select (combobox) list items "escape" bounding box in off-canvas forms in Chrome

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

@@ -647,6 +647,10 @@
   resize: vertical;
 }
 
+#drupal-off-canvas select[multiple] {
+  overflow: auto;
+}
+
 #drupal-off-canvas optgroup {
   color: black;
   font-weight: normal;

core/misc/dialog/off-canvas.reset.pcss.css

@@ -444,6 +444,9 @@
   min-height: 40px;
   resize: vertical;
 }
+#drupal-off-canvas select[multiple] {
+  overflow: auto;
+}
 #drupal-off-canvas optgroup {
   color: black;
   font-weight: normal;

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

@@ -647,6 +647,10 @@
   resize: vertical;
 }
 
+#drupal-off-canvas select[multiple] {
+  overflow: auto;
+}
+
 #drupal-off-canvas optgroup {
   color: black;
   font-weight: normal;

core/themes/stable/css/core/dialog/off-canvas.reset.pcss.css

@@ -444,6 +444,9 @@
   min-height: 40px;
   resize: vertical;
 }
+#drupal-off-canvas select[multiple] {
+  overflow: auto;
+}
 #drupal-off-canvas optgroup {
   color: black;
   font-weight: normal;

core/themes/stable9/css/core/dialog/off-canvas.reset.css

@@ -647,6 +647,10 @@
   resize: vertical;
 }
 
+#drupal-off-canvas select[multiple] {
+  overflow: auto;
+}
+
 #drupal-off-canvas optgroup {
   color: black;
   font-weight: normal;

core/themes/stable9/css/core/dialog/off-canvas.reset.pcss.css

@@ -444,6 +444,9 @@
   min-height: 40px;
   resize: vertical;
 }
+#drupal-off-canvas select[multiple] {
+  overflow: auto;
+}
 #drupal-off-canvas optgroup {
   color: black;
   font-weight: normal;