B4J Question Default color

'Save the default style
dim normalStyle as string =txt.style

'Change style
txt.style = $"
           -fx-background-color: 
           #000000,
           linear-gradient(#7ebcea, #2f4b8f),
           linear-gradient(#426ab7, #263e75),
           linear-gradient(#395cab, #223768);
        "$

'Return to default style
txt.Style = normalStyle

Sub Process_Globals
   Private fx As JFX
   Private MainForm As Form
   Private TextField1 As TextField
   Private Button1 As Button
   Private Button2 As Button
   Private defaultStyle As String
End Sub

Sub AppStart (Form1 As Form, Args() As String)
   MainForm = Form1
   MainForm.RootPane.LoadLayout("1") 'Load the layout file.
   MainForm.Show
   defaultStyle = TextField1.Style
End Sub

Sub Button1_Action
   CSSUtils.SetBackgroundColor(TextField1,fx.Colors.ARGB(127,255,0,0))
End Sub

Sub Button2_Action
   TextField1.Style = defaultStyle
End Sub