diff --git a/modoboa/extensions/webmail/static/webmail/css/webmail.css b/modoboa/extensions/webmail/static/webmail/css/webmail.css
index 1fa01886e..8cb587f65 100644
--- a/modoboa/extensions/webmail/static/webmail/css/webmail.css
+++ b/modoboa/extensions/webmail/static/webmail/css/webmail.css
@@ -50,6 +50,7 @@
 }
 
 body, html {
+    overflow: hidden;
     height: 100%;
 }