Toggle contain:strict on fullscreen (#5159)

* Toggle contain:strict on fullscreen

* Fix scss lint issue

* fix scss whitespace lint issue

app/javascript/styles/components.scss

@@ -1674,6 +1674,16 @@
   &.optionally-scrollable {
     overflow-y: auto;
   }
+
+  @supports(display: grid) { // hack to fix Chrome <57
+    contain: strict;
+  }
+}
+
+.scrollable.fullscreen {
+  @supports(display: grid) { // hack to fix Chrome <57
+    contain: none;
+  }
 }
 
 .column-back-button {