diff -r fe7d2bbf5f3f -r 946b21a1fbf6 QTfrontend/res/css/qt.css
--- a/QTfrontend/res/css/qt.css	Tue Aug 07 13:04:02 2018 +0200
+++ b/QTfrontend/res/css/qt.css	Tue Aug 07 16:07:13 2018 +0200
@@ -1,10 +1,10 @@
 /******************************************************************************
  *
- * CSS-like definition of Qt frontend appearance
+ * CSS definition of Qt frontend appearance: Default style.
  *
  ******************************************************************************
  *
- * see http://doc.qt.nokia.com/4.5/stylesheet.html
+ * see https://doc.qt.io/qt-5/style-reference.html
  *
  ******************************************************************************
  *