OOOWriteAndClear/OOO_WriteAndClear/Styles/AuthorizationUserControlStyles.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <SolidColorBrush x:Key="MainColor" Color="White"/>
    <SolidColorBrush x:Key="AdditionalColor" Color="#76e383"/>
    <SolidColorBrush x:Key="AccentColor" Color="#498c51"/>

    <Style x:Key="AuthorizationUserControl.LoginButton" TargetType="{x:Type Button}">
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Background" Value="{StaticResource AccentColor}"/>
        <Setter Property="Foreground" Value="White"/>
        <Setter Property="BorderThickness" Value="0"/>
        <Setter Property="HorizontalContentAlignment" Value="Center"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="Padding" Value="1"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">

                    <Border x:Name="border" 
                            Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            SnapsToDevicePixels="true"
                            CornerRadius="5">
                        <ContentPresenter x:Name="contentPresenter"
                                          Focusable="False"
                                          HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                          Margin="{TemplateBinding Padding}" RecognizesAccessKey="True"
                                          SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                    </Border>

                    <ControlTemplate.Triggers>

                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="border" Property="Background" Value="#185B20"/>
                        </Trigger>

                        <Trigger Property="IsPressed" Value="True">
                            <Setter TargetName="border" Property="Background" Value="#436948"/>
                        </Trigger>

                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>