<Style x:Key="GlassBorderStyle" TargetType="Border">
    <Setter Property="BorderThickness" Value="2"/>
    <Setter Property="Padding" Value="5"/>
    <Setter Property="Background">
        <Setter.Value>
            <LinearGradientBrush EndPoint="0.75,1" StartPoint="0.25,0">
                <GradientStop Color="#33FFFFFF" Offset="0"/>
                <GradientStop Color="#C0FFFFFF" Offset="0.287"/>
                <GradientStop Color="#4011322D" Offset="0.683"/>
                <GradientStop Color="#33FFFFFF" Offset="1"/>
            </LinearGradientBrush>
        </Setter.Value>
    </Setter>
    <Setter Property="BorderBrush">
        <Setter.Value>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="#5811322D" Offset="0"/>
                <GradientStop Color="#3EFFFFFF" Offset="0.25"/>
                <GradientStop Color="#FFFFFFFF" Offset="0.5"/>
                <GradientStop Color="#3EFFFFFF" Offset="0.75"/>
                <GradientStop Color="#BFFFFFFF" Offset="1"/>
            </LinearGradientBrush>
        </Setter.Value>
    </Setter>
    <Setter Property="Effect">
        <Setter.Value>
            <DropShadowEffect BlurRadius="3" ShadowDepth="3" Opacity="0.5"/>
        </Setter.Value>
    </Setter>
</Style>

<Border x:Name="GlassBorder" Height="100" Width="250" CornerRadius="10" Style="{StaticResource GlassBorderStyle}">
    <Button Content="Glass Border Style"/>
</Border>