ProgressBar.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
					xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
					xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
					xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
					xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
					mc:Ignorable="d">

	<x:Double x:Key="MaterialProgressBarMinWidth">250</x:Double>
	<x:Double x:Key="MaterialProgressBarHeight">4</x:Double>
	
	<Style x:Key="MaterialProgressBarStyle"
		   TargetType="muxc:ProgressBar">
		<Setter Property="Foreground"
				Value="{StaticResource PrimaryVariantDarkBrush}" />
		<Setter Property="Background"
				Value="{StaticResource PrimaryVariantLightBrush}" />
		<Setter Property="MinWidth"
				Value="{StaticResource MaterialProgressBarMinWidth}" />
		<Setter Property="Height"
				Value="{StaticResource MaterialProgressBarHeight}" />
	</Style>

</ResourceDictionary>