/// <summary>
        /// Returns CSS for export to HTML
        /// </summary>
        /// <returns>System.String.</returns>
        public override string GetCSS()
        {
            string result = "";

            if (BackgroundBrush is SolidBrush)
            {
                var s = ExportToHTML.GetColorAsString((BackgroundBrush as SolidBrush).Color);
                if (s != "")
                {
                    result += "background-color:" + s + ";";
                }
            }
            if (ForeBrush is SolidBrush)
            {
                var s = ExportToHTML.GetColorAsString((ForeBrush as SolidBrush).Color);
                if (s != "")
                {
                    result += "color:" + s + ";";
                }
            }
            if ((FontStyle & FontStyle.Bold) != 0)
            {
                result += "font-weight:bold;";
            }
            if ((FontStyle & FontStyle.Italic) != 0)
            {
                result += "font-style:oblique;";
            }
            if ((FontStyle & FontStyle.Strikeout) != 0)
            {
                result += "text-decoration:line-through;";
            }
            if ((FontStyle & FontStyle.Underline) != 0)
            {
                result += "text-decoration:underline;";
            }

            return(result);
        }