other android fixes

background.html

@@ -1,5 +1,8 @@
 <html>
-<head><meta charset="utf-8"/></head>
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
 <body>
 <script src="include/browser-polyfill.min.js" charset="UTF-8"></script>
 <script src="background-script.js" charset="UTF-8"></script>