Trying to change a theme's font-face, but not working

[hisnawi]

I am trying to modify the constant face in material theme this way:

    ;; Material theme
    (use-package material-theme
      :ensure t
      :config
      (set-face-attribute
       'font-lock-constant-face   nil :foreground "#FF6E64" :background "#990A1B" :bold t)
      )

What am I doing wrong?

[hisnawi]

Not material issue. Was setup error.