(interactive (list 'interactive))
(case command
('interactive (company-begin-backend 'company-css))
- ('prefix (and (eq major-mode 'css-mode)
+ ('prefix (and (derived-mode-p 'css-mode)
(or (company-grab company-css-tag-regexp 1)
(company-grab company-css-pseudo-regexp 1)
(company-grab company-css-property-value-regexp 2)