Fix positon of Events Header (#2045)

* Fix positon of events header on HiDpi devices

* lint

Author: eilifhl

frontend/src/Pages/EventsPage/components/EventsList/EventsList.module.scss

@@ -42,6 +42,8 @@ $event-header-bg-dark: rgba(31, 31, 31, 0.9);
   // Position
   top: $navbar-height;
   z-index: 1;
+  left: 0;
+  right: 0;
 
   @include for-mobile-only {
     position: absolute;