Put back horizontal scrolling option again

DOM document is 2-dimensional! What applies to one dimension, may apply
to another too. Never assume we're scrolling texts vertically only.

service2.js

@@ -319,7 +319,11 @@ class BesService {
     this.statusDiv.style.left = `${
       rect.right - parentRect.left - 40 - scrollbarWidth
     }px`
-    this.statusDiv.style.top = `${rect.bottom - parentRect.top - 30}px`
+    const scrollbarHeight =
+      this.hostElement.offsetHeight - this.hostElement.clientHeight
+    this.statusDiv.style.top = `${
+      rect.bottom - parentRect.top - 30 - scrollbarHeight
+    }px`
   }
 
   /**