title: How to set radial-gradient with css in javafx
body: <p>I have a Label. Try to set radial-gradient in my css for this lable.
  How can i do it right?
  If i set -fx-background-color: radial-gradient(center 50% 50%, radius 50%, rgb(104, 163, 193) 0%, rgb(23, 56, 99) 100%); - I receive an error "mismatched parameters"
  Thanks for any help!</p>