Merge branch 'hotfix/3.0.2'

Author: mmistakes

assets/_scss/_sidebar.scss

@@ -48,9 +48,11 @@
   margin-bottom: 1em;
 
   @include breakpoint($large) {
+    position: relative;
     float: right;
     width: $right-sidebar-width-narrow;
     margin-left: span(0.5 of 12);
+    z-index: 10;
   }
 
   @include breakpoint($x-large) {

assets/_scss/_utilities.scss

@@ -348,7 +348,7 @@ body:hover .visually-hidden button {
    ========================================================================== */
 
 .sticky {
-  @include breakpoint($medium) {
+  @include breakpoint($large) {
     @include clearfix();
     position: -webkit-sticky;
     position: sticky;