Default Blazor.Fast App.Razor

App.razor

<SystemProvider Theme="new ThemeProvider(ThemeType.Fast)" use-defaults>
 <Router AppAssembly="@typeof(Program).Assembly">
  <Found Context="routeData">
   <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
  </Found>
  <NotFound>
   <LayoutView Layout="@typeof(MainLayout)">
    <p>Sorry, there is nothing at this address.</p>
   </LayoutView>
  </NotFound>
 </Router>
</SystemProvider>