diff --git a/src/components/state-history-chart-timeline.html b/src/components/state-history-chart-timeline.html
index d34f477411..a25d9a5f21 100644
--- a/src/components/state-history-chart-timeline.html
+++ b/src/components/state-history-chart-timeline.html
@@ -1,6 +1,13 @@
 <link rel="import" href="../../bower_components/polymer/polymer.html">
 
+<style>
+  div.charts-tooltip {
+    z-index: 200 !important;
+  }
+</style>
+
 <script>
+
 Polymer({
   is: 'state-history-chart-timeline',