diff --git a/history.html b/history.html
index c639992..6f6441f 100644
--- a/history.html
+++ b/history.html
@@ -120,12 +120,13 @@
         }
       }
     </style>
-    <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css">
-    <link href='http://fonts.googleapis.com/css?family=Roboto+Slab' rel='stylesheet' type='text/css'>
-    <link rel="stylesheet" href="http://code.ionicframework.com/ionicons/1.5.2/css/ionicons.min.css">
-    <link href='https://cdnjs.cloudflare.com/ajax/libs/Leaflet.awesome-markers/2.0.2/leaflet.awesome-markers.css' rel='stylesheet' type='text/css'>
-    <script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.9.0/moment.min.js"></script>
-    <script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.css">
+    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto+Slab">
+    <link rel="stylesheet" href="https://code.ionicframework.com/ionicons/1.5.2/css/ionicons.min.css">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/Leaflet.awesome-markers/2.0.2/leaflet.awesome-markers.css">
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/chroma-js/0.6.3/chroma.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.9.0/moment.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/Leaflet.awesome-markers/2.0.2/leaflet.awesome-markers.min.js"></script>
     <script src="history.js"></script>
   </head>