diff --git a/app/index.html b/app/index.html
index 0a573adaf..fab73002a 100644
--- a/app/index.html
+++ b/app/index.html
@@ -37,7 +37,7 @@
     -->
 
     <!-- Material Design icons -->
-    <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
+    <link rel="stylesheet" style="text/css" href="https://fonts.googleapis.com/icon?family=Material+Icons">
 
 
     <!-- Material Design Lite page styles:
@@ -47,10 +47,10 @@
     material.blue-orange.min.css
     material.purple-indigo.min.css
     -->
-    <link rel="stylesheet" href="https://code.getmdl.io/1.2.1/material.indigo-pink.min.css">
+    <link rel="stylesheet" style="text/css" href="https://code.getmdl.io/1.2.1/material.indigo-pink.min.css">
 
     <!-- Your styles -->
-    <link rel="stylesheet" href="styles/main.css">
+    <link rel="stylesheet" style="text/css" href="styles/main.css">
   </head>
   <body class="mdl-demo mdl-color--grey-100 mdl-color-text--grey-700 mdl-base">
     <div class="mdl-layout mdl-js-layout mdl-layout--fixed-header">
