How to set backgroud color on GroupFooterTemplate

<GroupFooterTemplate style="background-color: red;">
                Group amount: <b>@String.Format(new System.Globalization.CultureInfo("en-US"), "{0:C}", context.Data.Items.Cast<Order>().Sum(o => o.Freight))</b>
            </GroupFooterTemplate>
```

You cannot set style on a template, the style should be set on an element declared in this template.