Vertical Scrollbar style is not working for firefox,chrome

        @(Html.Kendo().Window()
        .Name("InactiveTimeTableWindow")
        .HtmlAttributes(new { style = "max-height:400px;min-width:300px;background-color:#3B97C1;scrollbar-base-color:#666766" })
        .Visible(false)
        .Title("Next 7 Days Availability")
        .Events(e => e.Close("InactiveTimeTbleCloseClick"))
         .Content(@
       

        )
        )