Wino-Mail/Wino.Mail/Styles/Colors.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Microsoft.UI.Xaml.Media">

    <SolidColorBrush x:Key="FlaggedBrush">#e74c3c</SolidColorBrush>
    <SolidColorBrush x:Key="DeleteBrush">#e74c3c</SolidColorBrush>
    <SolidColorBrush x:Key="AttentionBrush">#ff7675</SolidColorBrush>

    <SolidColorBrush x:Key="FolderSyncBrush">#1abc9c</SolidColorBrush>

    <ResourceDictionary.ThemeDictionaries>
        <ResourceDictionary x:Name="Light">
            <SolidColorBrush x:Key="AttachmentBrush">#fdcb6e</SolidColorBrush>
            <SolidColorBrush x:Key="SettingsPaneBorderBrush">#636e72</SolidColorBrush>
            <SolidColorBrush x:Key="WinoContentZoneBackgroud" Color="White" />
        </ResourceDictionary>
        <ResourceDictionary x:Name="Dark">
            <SolidColorBrush x:Key="AttachmentBrush">#fdcb6e</SolidColorBrush>
            <SolidColorBrush x:Key="SettingsPaneBorderBrush">#2d3436</SolidColorBrush>
            <local:AcrylicBrush
                x:Key="WinoContentZoneBackgroud"
                BackgroundSource="Backdrop"
                FallbackColor="#2C2C2C"
                TintColor="#2C2C2C"
                TintOpacity="0.30" />
        </ResourceDictionary>
    </ResourceDictionary.ThemeDictionaries>
</ResourceDictionary>