Adds support for postcss in web-mode

.emacs

@@ -209,6 +209,7 @@
 	)
   (custom-set-faces
    '(lsp-ui-doc-background ((t (:background "#373B41")))))
+  (add-to-list 'lsp-language-id-configuration '("\\.postcss\\'" . "css"))
   (advice-add 'lsp :before
 			  (lambda (&rest _args)
 				(eval '(setf (lsp-session-server-id->folders (lsp-session)) (ht)
@@ -569,8 +570,11 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (use-package web-mode
-  :mode "\\.html?\\'" "\\.svelte\\'"
-  :interpreter "html" "svelte"
+  :mode "\\.html?\\'" "\\.svelte\\'" "\\.\\(post\\)?css\\'"
+  :interpreter "html" "css" "svelte"
+  :config
+  (setq web-mode-content-types-alist
+		'(("css" . "\\.\\(post\\)?css\\'")))
   :hook
   (web-mode . lsp-deferred)
 )