Shaker/Avalonia/SukiUI/Theme/Calendar/CalendarButton.axaml

<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ControlTheme x:Key="SukiCalendarButtonStyle" TargetType="CalendarButton">
        <Setter Property="ClickMode" Value="Release" />
        <Setter Property="MinWidth" Value="55" />
        <Setter Property="MinHeight" Value="50" />
        <Setter Property="Foreground" Value="{DynamicResource SukiText}" />
        <Setter Property="Background" Value="{DynamicResource SukiPrimaryColor0}" />
        <Setter Property="BorderBrush" Value="{DynamicResource SukiBorderBrush}" />
        <Setter Property="CornerRadius" Value="{DynamicResource SmallCornerRadius}" />
        <Setter Property="ClipToBounds" Value="False" />
        <!-- <Setter Property="HorizontalAlignment" Value="Center" /> -->
        <Setter Property="VerticalAlignment" Value="Center" />
        <Setter Property="HorizontalContentAlignment" Value="Center" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="Template">
            <ControlTemplate>
                <Panel>
                    <Border Name="Root"
                            Margin="5"
                            Padding="5"
                            Background="{TemplateBinding Background}"
                            ClipToBounds="True"
                            CornerRadius="{TemplateBinding CornerRadius}">
                        <Border.Transitions>
                            <Transitions>
                                <BrushTransition Property="Background" Duration="{DynamicResource ShortAnimationDuration}" />
                            </Transitions>
                        </Border.Transitions>
                        <ContentControl Name="Content"
                                        Margin="{TemplateBinding Padding}"
                                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                        VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                        Content="{TemplateBinding Content}"
                                        ContentTemplate="{TemplateBinding ContentTemplate}"
                                        FontSize="{TemplateBinding FontSize}" />
                    </Border>
                </Panel>
            </ControlTemplate>
        </Setter>
        <Style Selector="^:pointerover">
            <Setter Property="Background" Value="{DynamicResource SukiPrimaryColor25}" />
        </Style>
        <Style Selector="^:pressed">
            <Setter Property="Background" Value="{DynamicResource SukiPrimaryColor75}" />
        </Style>
        <Style Selector="^:selected">
            <Setter Property="Background" Value="{DynamicResource SukiPrimaryColor50}" />
            <Setter Property="TextElement.FontWeight" Value="Bold" />
        </Style>
        <Style Selector="^:inactive /template/ Border#Root">
            <Setter Property="Opacity" Value="0.32" />
        </Style>
        <Style Selector="^:disabled /template/ ContentControl#Content">
            <Setter Property="Opacity" Value="0.32" />
        </Style>
    </ControlTheme>
    <ControlTheme x:Key="{x:Type CalendarButton}"
                  BasedOn="{StaticResource SukiCalendarButtonStyle}"
                  TargetType="CalendarButton" />
</ResourceDictionary>