Semi.Avalonia/src/Semi.Avalonia.TreeDataGrid/Dark.axaml

<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <!--  Add Resources Here  -->
    <SolidColorBrush x:Key="TreeDataGridGridLinesBrush" Opacity="0.08" Color="White" />
    <SolidColorBrush x:Key="TreeDataGridHeaderPointerOverBackground" Opacity="0.16" Color="White" />
    <SolidColorBrush x:Key="TreeDataGridHeaderPressedBackground" Opacity="0.20" Color="White" />
    <SolidColorBrush x:Key="TreeDataGridHeaderPointerOverBorderBrush" Color="Transparent" />
    <SolidColorBrush x:Key="TreeDataGridHeaderPressedBorderBrush" Color="Transparent" />
    <SolidColorBrush x:Key="TreeDataGridHeaderPointerOverForeground" Opacity="0.8" Color="#F9F9F9" />
    <SolidColorBrush x:Key="TreeDataGridHeaderPressedForeground" Opacity="1" Color="#F9F9F9" />
    <SolidColorBrush x:Key="TreeDataGridCellSelectedBackground" Opacity="0.2" Color="#FF54A9FF" />
    <SolidColorBrush x:Key="TreeDataGridColumnHeaderForeground" Opacity="0.6" Color="#F9F9F9" />
</ResourceDictionary>