diff --git a/css/progress-bar.css b/css/progress-bar.css
index a0ab87b0d2f0684cd53d6323e1b6c65017435aa1..25f234bb016da4d4ee2a7a4ff639aaf8b72d78fa 100644
--- a/css/progress-bar.css
+++ b/css/progress-bar.css
@@ -5,7 +5,7 @@
 }
 
 .progress-bar + .tooltip {
-  z-index: ;2
+  z-index: 2;
 }
 
 .progress-bar + .tooltip > .tooltip-inner {