App.axaml

<prism:PrismApplication xmlns="https://github.com/avaloniaui"
                        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                        xmlns:prism="http://prismlibrary.com/"
                        xmlns:semi="https://irihi.tech/semi"
                        x:Class="EventBusDemo.App">
    <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->

    <prism:PrismApplication.Styles>
        <semi:SemiTheme Locale="zh-CN" />
        <semi:UrsaSemiTheme Locale="zh-CN" />
    </prism:PrismApplication.Styles>
    <prism:PrismApplication.Resources>
        <ResourceDictionary>
            <FontWeight x:Key="ButtonDefaultFontWeight">500</FontWeight>
            <FontWeight x:Key="TextBlockTitleFontWeight">500</FontWeight>
            <FontWeight x:Key="ToggleButtonDefaultFontWeight">500</FontWeight>
            <FontWeight x:Key="ExpanderHeaderFontWeight">500</FontWeight>
            <ResourceDictionary.ThemeDictionaries>
                <ResourceDictionary x:Key="Dark">
                    <SolidColorBrush x:Key="WindowDefaultBackground" Color="#404263" />
                    <SolidColorBrush x:Key="WindowDefaultForeground" Color="#3c525f" />
                </ResourceDictionary>
            </ResourceDictionary.ThemeDictionaries>
        </ResourceDictionary>
    </prism:PrismApplication.Resources>
</prism:PrismApplication>