DemoService/App.axaml

<Application xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="DemoService.App"
             RequestedThemeVariant="Light">
             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->

    <Application.Styles>
        <FluentTheme />
    </Application.Styles>
	<Application.Resources>
		<SolidColorBrush x:Key="PrimaryColor">#ffffff</SolidColorBrush>
		<SolidColorBrush x:Key="SecondryColor">#ffffe1</SolidColorBrush>
		<SolidColorBrush x:Key="AccentColor">#ff9c1a</SolidColorBrush>
	</Application.Resources>
</Application>