Change default page font and margin

static/index.html

@@ -44,8 +44,9 @@
 
 		<style type="text/css">
 		body {
-		    font-family: Arial, sans-serif;
+		    font-family: Helvetica, Tahoma, Arial, sans-serif;
 			font-size: 100%;
+			margin: 1em;
 		}
 		</style>