default css faces inherit from standard faces

my config is
  (set-face-attribute 'web-mode-css-rule-face         nil :foreground
"orchid3")
  (set-face-attribute 'web-mode-css-pseudo-class-face nil :foreground
"plum2")
  (set-face-attribute 'web-mode-css-prop-face         nil :foreground
"Pink3")