gravatar using https

static/css/style.css

@@ -102,7 +102,7 @@ pre {
     height: 150px;
     float: right; border: 2px, solid, #000000;
     border-radius: 10px;
-    background-image: url(http://www.gravatar.com/avatar/8d18fec40a74782052fb4c007d212475?s=150);
+    background-image: url(https://www.gravatar.com/avatar/8d18fec40a74782052fb4c007d212475?s=150);
     margin-left: 2em;
     margin-bottom: 1em;
 }