add border color from figma
MODIFY
WalletWasabi.Fluent/Controls/Dialog.axaml
WalletWasabi.Fluent/Controls/Dialog.axaml
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}">
<Border Name="PART_Border"
+ BorderThickness="1"
+ BorderBrush="{DynamicResource TileBorderColor}"
Background="{DynamicResource RegionColor}"
MaxWidth="{TemplateBinding MaxContentWidth}" MaxHeight="{TemplateBinding MaxContentHeight}">
<Panel Name="PART_Dismiss">

MODIFY
WalletWasabi.Fluent/Styles/Themes/BaseDark.axaml
WalletWasabi.Fluent/Styles/Themes/BaseDark.axaml
<StaticResource x:Key="TextControlBorderBrushFocused" ResourceKey="SystemBaseMediumHighColor" />
<Color x:Key="TileRegionColor">#09ffffff</Color>
- <Color x:Key="TileBorderColor">#09ffffff</Color>
+ <Color x:Key="TileBorderColor">#66757575</Color>
<Color x:Key="AcrylicTrimForeground">White</Color>
<Color x:Key="AcrylicTrimBackground">#232A33</Color>

add border color from figma