inabox/InABox.Avalonia/Theme/Classes/CheckBox.axaml

<Styles xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
	<Style Selector="CheckBox.small">
		<Setter Property="Template">
            <ControlTemplate>
                <Grid x:Name="RootGrid" ColumnDefinitions="20,*">
                    <Border x:Name="PART_Border"
                                    Grid.ColumnSpan="2"
                                    Background="{TemplateBinding Background}"
                                    BorderBrush="{TemplateBinding BorderBrush}"
                                    BorderThickness="{TemplateBinding BorderThickness}"
                                    CornerRadius="{TemplateBinding CornerRadius}" />

                    <Grid VerticalAlignment="Top" Height="32">
                        <Border x:Name="NormalRectangle"
                                        BorderBrush="{DynamicResource CheckBoxCheckBackgroundStrokeUnchecked}"
                                        Background="{DynamicResource CheckBoxCheckBackgroundFillUnchecked}"
                                        BorderThickness="{DynamicResource CheckBoxBorderThemeThickness}"
                                        CornerRadius="{TemplateBinding CornerRadius}"
                                        UseLayoutRounding="False"
                                        Height="{TemplateBinding Height}"
                                        Width="{TemplateBinding Height}" />

                        <Viewbox UseLayoutRounding="False">
                            <Panel>
                                <Panel Height="16" Width="16" />
                                <Path x:Name="CheckGlyph"
                                            Opacity="0"
                                            Fill="{DynamicResource CheckBoxCheckGlyphForegroundUnchecked}"
                                            Stretch="Uniform"
                                            VerticalAlignment="Center"
                                            FlowDirection="LeftToRight" />
                            </Panel>
                        </Viewbox>
                    </Grid>
                    <ContentPresenter x:Name="PART_ContentPresenter"
                                                    ContentTemplate="{TemplateBinding ContentTemplate}"
                                                    Content="{TemplateBinding Content}"
                                                    Margin="{TemplateBinding Padding}"
                                                    RecognizesAccessKey="True"
                                                    HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                                    VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                                    TextWrapping="Wrap"
                                                    Grid.Column="1" />
                </Grid>
            </ControlTemplate>
        </Setter>
	</Style>
</Styles>