Let browser set overflow-x scroll on user activity calendar.

app/assets/stylesheets/framework/calendar.scss

@@ -5,7 +5,7 @@
   direction: rtl;
 
   @media (min-width: $screen-sm-min) and (max-width: $screen-md-max) {
-    overflow-x: scroll;
+    overflow-x: auto;
   }
 }
 

changelogs/unreleased/user-activity-scroll-bar.yml

+---
+title: Fix preemptive scroll bar on user activity calendar.
+merge_request: !10636
+author: