diff --git a/public/index.html b/public/index.html
index fb7a5b6..0158b54 100644
--- a/public/index.html
+++ b/public/index.html
@@ -3,9 +3,9 @@
 <head>
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
     <title>Tweet in a sign</title>
-    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js" type="text/javascript"></script> 
-    <script src="http://www.skulpt.org/static/skulpt.min.js" type="text/javascript"></script> 
-    <script src="http://www.skulpt.org/static/skulpt-stdlib.js" type="text/javascript"></script> 
+    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js" type="text/javascript"></script> 
+    <script src="//www.skulpt.org/static/skulpt.min.js" type="text/javascript"></script> 
+    <script src="//www.skulpt.org/static/skulpt-stdlib.js" type="text/javascript"></script> 
 </head>
 <body>
     <script type="text/javascript">
@@ -59,7 +59,7 @@ print(figure)`;
         var scriptFile = document.createElement('script');
         scriptFile.type = 'text/javascript';
         scriptFile.async = true;
-        scriptFile.src = 'https://platform.twitter.com/widgets.js';
+        scriptFile.src = '//platform.twitter.com/widgets.js';
         var s = document.getElementsByTagName('script')[0]; 
         s.parentNode.insertBefore(scriptFile, s);
     },
@@ -72,6 +72,6 @@ print(figure)`;
 <input id="text" type="text"><button onclick="runit()">Declarar</button>
 <br>
 <textarea name="" id="output" cols="30" rows="10"></textarea>
-<a href="https://twitter.com/share?ref_src=twsrc%5Etfw" class="twitter-share-button" id="tweet" data-text="nothing" data-show-count="false">Tweet</a><script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
+<a href="//twitter.com/share?ref_src=twsrc%5Etfw" class="twitter-share-button" id="tweet" data-text="nothing" data-show-count="false">Tweet</a><script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
 </body>
 </html>
\ No newline at end of file
