- add button styles

Mystify/Resources/Styles/ButtonStyles.axaml

@@ -0,0 +1,45 @@
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:themes="clr-namespace:Mystify.Resources.Themes">
+    <Design.PreviewWith>
+        <Border Padding="20">
+            <Button Height="100" Width="250" Content="Test"/>
+        </Border>
+    </Design.PreviewWith>
+
+    <Styles.Resources>
+        <SolidColorBrush x:Key="ButtonBackground" Color="{x:Static themes:DarkTheme.BUTTON_BACKGROUND}"/>
+        <SolidColorBrush x:Key="ButtonForeground" Color="{x:Static themes:DarkTheme.BUTTON_FOREGROUND}"/>
+        <SolidColorBrush x:Key="ButtonBorder" Color="{x:Static themes:DarkTheme.BUTTON_BORDER}"/>
+        <SolidColorBrush x:Key="ButtonMouseOverBackground" Color="{x:Static themes:DarkTheme.BUTTON_MOUSE_OVER_BACKGROUND}"/>
+    </Styles.Resources>
+    
+    <Style Selector="Button">
+        <Setter Property="Background" Value="{StaticResource ButtonBackground}"/>
+        <Setter Property="Foreground" Value="{StaticResource ButtonForeground}"/>
+        <Setter Property="BorderBrush" Value="{StaticResource ButtonBorder}"/>
+        <Setter Property="BorderThickness" Value="1"/>
+        
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="{x:Type Button}">
+                    <Border BorderThickness="{TemplateBinding BorderThickness}"
+                            BorderBrush="{TemplateBinding BorderBrush}"
+                            Background="{TemplateBinding Background}"
+                            CornerRadius="5">
+                        <ContentPresenter VerticalAlignment="Stretch"
+                                          HorizontalAlignment="Stretch"
+                                          VerticalContentAlignment="Center"
+                                          HorizontalContentAlignment="Center"
+                                          Background="Transparent"
+                                          Content="{TemplateBinding Content}"/>
+                    </Border>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+    
+    <Style Selector="Button:pointerover">
+        <Setter Property="Background" Value="{StaticResource ButtonMouseOverBackground}"/>
+    </Style>
+</Styles>