diff --git a/tpl/_head.twig b/tpl/_head.twig
index 145d668..60ef888 100644
--- a/tpl/_head.twig
+++ b/tpl/_head.twig
@@ -6,6 +6,6 @@
         <link rel="stylesheet" href="./tpl/css/style.css" media="all">
         <link rel="stylesheet" href="./tpl/css/style-{{ constant('THEME') }}.css" media="all" title="{{ constant('THEME') }} theme">
         <link rel="stylesheet" href="./tpl/css/messages.css" media="all">
-        <link href='http://fonts.googleapis.com/css?family=Roboto' rel='stylesheet' type='text/css'>
+        <link href='//fonts.googleapis.com/css?family=Roboto' rel='stylesheet' type='text/css'>
         <script src="./tpl/js/jquery-2.0.3.min.js"></script>
         <script type="text/javascript">$(document).ready(function(){$("body").prepend('<a href="#top" class="top_link" title="{% trans "back to top" %}"><img src="./tpl/img/{{ constant("THEME") }}/backtotop.png" alt={% trans "back to top" %}"/></a>');$(".top_link").css({position:"fixed",right:"15px",bottom:"15px",display:"none",padding:"20px",background:"#ccc","-moz-border-radius":"40px","-webkit-border-radius":"40px","border-radius":"40px",opacity:"0.9","z-index":"2000"});$(window).scroll(function(){posScroll=$(document).scrollTop();if(posScroll>=400)$(".top_link").fadeIn(600);else $(".top_link").fadeOut(600)})})</script>
\ No newline at end of file