diff -r 9e2211f5f293 command-window.cpp
--- a/command-window.cpp	Tue May 28 23:06:08 2019 -0400
+++ b/command-window.cpp	Thu May 30 00:35:45 2019 +0200
@@ -164,11 +164,11 @@ namespace calc
              this, SLOT (close (void)));

     insert_at_end
-      ("Qt Example Calculator.\n"
-       "Available operations: + - * / ^ ()\n"
-       "Semicolon terminates statement.\n"
-       "Up Arrow key moves to previous line in the command history.\n"
-       "Down Arrow key moves to next line in the comand history.\n\n");
+      ("Qt Example Calculator.<br>\n"
+       "Available operations: + - * / ^ ()<br>\n"
+       "Semicolon terminates statement.<br>\n"
+       "Up Arrow key moves to previous line in the command history.<br>\n"
+       "Down Arrow key moves to next line in the comand history.<br><br>\n\n");

     beg_mark = set_mark ();

@@ -197,7 +197,7 @@ namespace calc

   void command_window::accept_line (const std::string& line)
   {
-    insert_at_end ("\n");
+    insert_at_end ("<br>\n");

     if (! line.empty ())
       {
@@ -226,7 +226,7 @@ namespace calc

   void command_window::handle_error (const QString& msg)
   {
-    insert_at_end ("parse error: " + msg.toStdString () + "\n");
+    insert_at_end ("<span style='color:red'>parse error: " + msg.toStdString () + "</span><br>\n");

     rl_abort (0, 0);
   }
@@ -397,7 +397,7 @@ namespace calc
   {
     QTextCursor cursor = textCursor ();

-    cursor.insertText (QString::fromStdString (text));
+    cursor.insertHtml (QString::fromStdString (text));

     setTextCursor (cursor);
   }
@@ -423,7 +423,7 @@ namespace calc
   {
     std::ostringstream buf;

-    buf << "ans = " << value << "\n";
+    buf << "<b>ans = </b>" << value << "<br>\n";

     insert_at_cursor (buf.str ());