diff --git a/web/skins/classic/css/flat/views/montage.css b/web/skins/classic/css/flat/views/montage.css
index 7c571f7c1..479ade89e 100644
--- a/web/skins/classic/css/flat/views/montage.css
+++ b/web/skins/classic/css/flat/views/montage.css
@@ -6,6 +6,15 @@
     width: 99%;
 }
 
+#monitors:after {
+  content: ".";
+  display: block;
+  height: 0;
+  font-size: 0;
+  clear: both;
+  visibility: hidden;
+}
+
 #monitors .monitor {
   min-width: 180px;
   margin: 0;