B4J Question Transparent button that changes color when clicked.

.TransparentButton {
  -fx-background-color: transparent;
}
.TransparentButton:pressed {
  -fx-background-color: blue;
}

Sub Process_Globals
   Private fx As JFX
   Private MainForm As Form
   Private button1 As Button
End Sub

Sub AppStart (Form1 As Form, Args() As String)
   MainForm = Form1
   button1.Initialize("button1")
   button1.StyleClasses.Add("TransparentButton")
   button1.Text = "abc"
   MainForm.Stylesheets.Add(File.GetUri(File.DirAssets, "1.css"))
   MainForm.RootPane.AddNode(button1, 10, 10, 300, 300)
   MainForm.Show
End Sub

Sub Button1_Action
   Log("clicked")
End Sub