1 files changed, 6 insertions, 2 deletions
diff --git a/assets/script.js b/assets/script.js
index b30305a48..fbae0417c 100644
--- a/assets/script.js
+++ b/assets/script.js
@@ -592,8 +592,12 @@ function measurePositions() {
     }
     // add an extra one to mark the top/bottom of the last message footer spacer
     overlayTops[i] = "" + prevBodyBottom;
-    overlayBottoms[i] = "" + document.body.offsetHeight;
-
+    var body = document.body,
+        html = document.documentElement;
+    // get the true height of the value - the max of 4 possibilities
+    var height = Math.max(body.scrollHeight, body.offsetHeight,
+            html.scrollHeight, html.offsetHeight);
+    overlayBottoms[i] = "" + height;
     window.mail.onWebContentGeometryChange(overlayTops, overlayBottoms);
 }