optimize agenda view scrolling

src/common/common.css

@@ -501,7 +501,6 @@ temporary rendered events).
 .fc-scroller > .fc-time-grid {
 	position: relative; /* re-scope all positions */
 	width: 100%; /* hack to force re-sizing this inner element when scrollbars appear/disappear */
-	overflow: hidden; /* don't let negative margins or absolute positioning create further scroll */
 }