Fixed a bug in vertical offset when height of container > height of contents

src/timeline/Timeline.js

@@ -595,6 +595,9 @@ Timeline.prototype.redraw = function() {
 
   // reposition the scrollable contents
   var offset = this.props.scrollTop;
+  if (options.orientation == 'bottom') {
+    offset += Math.max(this.props.centerContainer.height - this.props.center.height, 0);
+  }
   dom.center.style.left = '0';
   dom.center.style.top  = offset + 'px';
   dom.left.style.left   = '0';

test/timeline_groups.html

@@ -80,7 +80,7 @@
       updateGroup: true
     },
     //stack: false,
-    height: 200,
+    //height: 200,
     groupOrder: 'content'
   };