Improve demo page header font rendering

Author: lokesh

css/screen.css

@@ -10,7 +10,7 @@
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 
 	<link rel="shortcut icon" href="img/demopage/favicon.png">
-	<link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Karla%7CMontserrat">
+	<link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Karla%7CMontserrat:700">
 	<link rel="stylesheet" href="css/screen.css">
 	<link rel="stylesheet" href="css/lightbox.css">
 </head>

index.html

@@ -66,7 +66,7 @@ h1, h2, h3, h4, h5
   color: $heading-color
   line-height: 1.2em
   font-family: $heading-font-family
-  font-weight: 600
+  font-weight: 700
 
 h1
   font-size: 3.5rem