PowerToys/src/modules/launcher/PowerLauncher/Themes/HighContrast1.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:options="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
    xmlns:system="clr-namespace:System;assembly=System.Runtime"
    mc:Ignorable="options">

    <Color x:Key="LauncherBackgroundColor">#505b5e</Color>
    <!--  Metadata  -->
    <system:String x:Key="Theme.Name">HighContrast.Accent2</system:String>
    <system:String x:Key="Theme.Origin">PowerToysRun</system:String>
    <system:String x:Key="Theme.DisplayName">Accent2 (HighContrast)</system:String>
    <system:String x:Key="Theme.BaseColorScheme">HighContrast</system:String>
    <system:String x:Key="Theme.ColorScheme">Accent2</system:String>
    <Color x:Key="Theme.PrimaryAccentColor">White</Color>
</ResourceDictionary>