--- a/src/pyams_skin/resources/less/modal.less	Sat Feb 28 16:17:45 2015 +0100
+++ b/src/pyams_skin/resources/less/modal.less	Mon Mar 02 11:14:48 2015 +0100
@@ -4,6 +4,7 @@
 
 .modal-backdrop,
 .modal-backdrop.fade.in {
+	position: fixed;
 	width: 100%;
 	height: 100%;
 }