Change Button Background color through MVVM pattern in WPF

I am using MVVM light with WPF. I want to set button background color based on some specific condition through ViewModel. Kindly suggest some way to get it. Thanks

Using triggers:

<Button>
    <Button.Style>
        <Style TargetType="Button">
            <!-- Set the default value here (if any). 
                 If you set it directly on the button that will override the trigger. -->
            <Setter Property="Background" Value="LightGreen" />
            <Style.Triggers>
                <DataTrigger Binding="{Binding SomeConditionalProperty}"
                             Value="True">
                    <Setter Property="Background" Value="Pink" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

Explanation of the comment.

Using a dependent property in a view model (MVVM):

public bool SomeConditionalProperty 
{
    get { /*...*/ }
    set
    {
        //...

        OnPropertyChanged(nameof(SomeConditionalProperty));
        //Because Background is dependent on this property.
        OnPropertyChanged(nameof(Background));
    }
}

public Brush Background =>
    SomeConditionalProperty ? Brushes.Pink : Brushes.LightGreen;

Then you just bind to Background.