.radio-button .radio  {
   -fx-background-color:
        -fx-box-border,
        linear-gradient(to bottom, derive(-fx-accent,95%), derive(-fx-accent,10%)),
        linear-gradient(to bottom, derive(-fx-accent,38%), -fx-accent);
   -fx-background-insets: 0 0 -1 0,  0,  1,  2;
   -fx-background-radius: 1.0em; /* large value to make sure this remains circular */
   -fx-padding: 0.333333em; /* 4 -- padding from outside edge to the inner black dot */
}