There is a mismatch between definitions found in caspian.css and the CSS-Documentation:
a) "-fx-text-fill: -fx-mid-text-color, white;" has to colors whereas the documentation says "-fx-text-fill <paint>"
b) -fx-graphic-vpos is not documented at all
c) "-fx-border-color:
        /* inner border: A copy of the inner border used above in the general column header area. */
        derive(-fx-base, 80%)
        linear-gradient(to bottom, derive(-fx-base,80%) 20%, derive(-fx-base,-10%) 90%),
        derive(-fx-base, 10%)
        linear-gradient(to bottom, derive(-fx-base,80%) 20%, derive(-fx-base,-10%) 90%),
        /* outer border: Slightly different to the above*/
        transparent transparent -fx-table-header-border-color -fx-table-header-border-color;"
which is speced as "<paint> | <paint> <paint> <paint> <paint> [ , [<paint> | <paint> <paint> <paint> <paint>] ]*" my guess is that the first "," after the linear gradient has to be removed but I might be wrong