adjust dialog background color
MODIFY
WalletWasabi.Fluent/Controls/Dialog.xaml
WalletWasabi.Fluent/Controls/Dialog.xaml
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
Margin="20">
<Border CornerRadius="4" BoxShadow="{DynamicResource DialogBoxShadow}"
- Background="{DynamicResource DialogBackground}"
+ Background="{DynamicResource RegionColor}"
MaxWidth="{TemplateBinding MaxContentWidth}" MaxHeight="{TemplateBinding MaxContentHeight}" Margin="40">
<ContentPresenter Name="PART_ContentPresenter" Margin="16 28 16 16"
Background="{TemplateBinding Background}"

MODIFY
WalletWasabi.Fluent/Styles/Themes/BaseDark.xaml
WalletWasabi.Fluent/Styles/Themes/BaseDark.xaml
<SolidColorBrush x:Key="OptionButtonBorderBrush">#7FFFFFFF</SolidColorBrush>
<SolidColorBrush x:Key="DialogOverlayColor">#7F2E2E2E</SolidColorBrush>
- <SolidColorBrush x:Key="DialogBackground">#323232</SolidColorBrush>
<BoxShadows x:Key="DialogBoxShadow">4 11 30 1 #3F000000</BoxShadows>
<StaticResource x:Key="TagsBoxControlForeground" ResourceKey="TextControlForeground" />

MODIFY
WalletWasabi.Fluent/Styles/Themes/BaseLight.xaml
WalletWasabi.Fluent/Styles/Themes/BaseLight.xaml
<SolidColorBrush x:Key="OptionButtonBorderBrush">#7F000000</SolidColorBrush>
<SolidColorBrush x:Key="DialogOverlayColor">#7F7A7A7A</SolidColorBrush>
- <SolidColorBrush x:Key="DialogBackground">#FFFFFF</SolidColorBrush>
<BoxShadows x:Key="DialogBoxShadow">4 11 30 1 #3F000000</BoxShadows>
<StaticResource x:Key="TagsBoxControlForeground" ResourceKey="TextControlForeground" />

adjust dialog background color