protected override void GenerateBackgroundVariantStyles(StringBuilder sb, Theme theme, string variant)
        {
            sb.Append($".bg-{variant}").Append("{")
            .Append($"background-color: {Var( ThemeVariables.BackgroundColor( variant ) )} !important;")
            .AppendLine("}");

            sb.Append($".jumbotron-{variant}").Append("{")
            .Append($"background-color: {Var( ThemeVariables.BackgroundColor( variant ) )} !important;")
            .Append($"color: {ToHex( Contrast( theme, Var( ThemeVariables.BackgroundColor( variant ) ) ) )} !important;")
            .AppendLine("}");
        }
 protected override void GenerateBorderVariantStyles(StringBuilder sb, Theme theme, string variant)
 {
     sb.Append($".border-{variant}").Append("{")
     .Append($"border-color: {Var( ThemeVariables.BackgroundColor( variant ) )} !important;")
     .AppendLine("}");
 }