diff --git a/src/main/webapp/static/cp_offline_menu_mat/mktree.css b/src/main/webapp/static/cp_offline_menu_mat/mktree.css
index fe7986d1a8597e6df04d977c3ccf28d95a5ab3c7..7cb8494928f622167ab7a307bfe04079e475f5ed 100644
--- a/src/main/webapp/static/cp_offline_menu_mat/mktree.css
+++ b/src/main/webapp/static/cp_offline_menu_mat/mktree.css
@@ -19,10 +19,12 @@ html, body {
 }
 #main {
 	background:#fff;
+	width: 100%;
+	height:100%;
 	min-height:500px;
 }
 #menu { width:250px; float:left; font-size: 90%; padding: 5px;}
-#content {margin-left:250px; position:relative;}
+#content {margin-left:250px; position:relative; height: 100%;}
 #content iframe { width:100%; min-height:100%; border:none; }
 
 /* Turn off list bullets */