Make qml rectangle the same color as background

[Snorlax]

I have a rectangle defined in Qt quick as :

Rectangle{
     id: toolbar
     width: 420
     height: 100
     color: "#303030"
}

I want to dynamically define the color to match the background color I defined in qtquickcontrols2.conf:

[Controls]
Style=Material

[Material]
Theme=Dark
;Accent=BlueGrey
;Primary=BlueGray
;Foreground=Brown
Background=#404040

How can I make the background color of the rectangle match the theme color without manually changing it?

[Snorlax]

Simple solution:

Rectangle{
     id: toolbar
     width: 420
     height: 100
     color: background.color
}

unfortunately this solution means the rectangle will appear white in design previews, which can make designing dark-mode UI difficult

[lemons]

As you override the default settings for the material style with the conf file, you can simply address them:

//import QtQuick.Controls.Material 2.12

Rectangle{
    id: toolbar
    width: 420
    height: 100
    // Material.accent | Material.primary | Material.foreground | Material.background
    color: Material.background
    Component.onCompleted: console.debug(color)
}