How to change color of title in installation?

[narae]

I want to change color of title in installation.
at config. xml(https://doc.qt.io/qtinstallerframework/qt-installer-framework-stylesheet-example.html)

<TitleColor>#FFFFFF</TitleColor>

: Color of title in installation screen is white.

I create controller.qs

function Controller()
{
    
}

Controller.prototype.IntroductionPageCallback = function()
{
    var widget = gui.currentPageWidget();
    if(widget != null){
        widget.title = "New title";
        widget.MessageLabel.setText("New Message");
    }
}

config.xml (https://doc.qt.io/qtinstallerframework/noninteractive.html)

<TitleColor>#123456</TitleColor>
<ControlScript>controller.qs</ControlScript>

Then only the title color of the IntroductionPage is black.
How can I change color of title in IntroductionPage to white?

++
I consider to use style sheet, but I couldn't find element for color of title.
(https://doc.qt.io/qt-5/stylesheet-reference.html)

[Bonnie]

What do you exactly want?
I'm very confused by your description...
Do you mean you want the title to be white in the IntroductionPage but black in other pages?

[narae]

@Bonnie No, the title color of all pages must be white. But after adding controller.qs, IntroductionPage's title color is black. The title changes to "New Title" in controller.qs.

[Bonnie]

@narae
Then do you have to change the title text?
If you don't change it, it will be white.

[narae]

@Bonnie Yes, I need to change text of title.

[Bonnie]

@narae
Ok.
Actually the installer set the title color by using rich text (html code).
So you can do the same

widget.title = "<font color=\"#FFFFFF\">New title</font>";

[narae]

@Bonnie Thanks for you answer. It works.