Improve text contrast

Author: keerlu

firebase/notifications-example/public/index.html

@@ -41,14 +41,14 @@
 
     <style media="screen">
       body {
-        background: #eceff1;
+        /* background: white; */
         color: rgba(0, 0, 0, 0.87);
         font-family: Roboto, Helvetica, Arial, sans-serif;
         margin: 0;
         padding: 0;
       }
       .load {
-        color: rgba(0, 0, 0, 0.4);
+        color: #525252;
         text-align: center;
         font-size: 13px;
       }