diff --git a/ghpr-review.el b/ghpr-review.el
index 03d91bd..3d3c1df 100644
--- a/ghpr-review.el
+++ b/ghpr-review.el
@@ -37,15 +37,25 @@
 (require 'ghpr-utils)
 
 (defface ghpr-review-added-line
-  '((t (:background "green" :foreground "black")))
+  '((t (:inherit diff-indicator-added)))
   "Face for added lines in PR diff."
   :group 'ghpr)
 
 (defface ghpr-review-removed-line
-  '((t (:background "red" :foreground "black")))
+  '((t (:inherit diff-indicator-removed)))
   "Face for removed lines in PR diff."
   :group 'ghpr)
 
+(defface ghpr-review-existing-review
+  '((t (:foreground "purple")))
+  "Face for existing review comments."
+  :group 'ghpr)
+
+(defface ghpr-review-misc-line
+  '((t (:inherit diff-header)))
+  "Face for miscellaneous lines in PR diff."
+  :group 'ghpr)
+
 (defvar ghpr-review-font-lock-keywords
   '(("^\\(> \\+[^+]\\)\\(.*\\)$"
      (0 'ghpr-review-added-line t))
@@ -54,7 +64,11 @@
     ("^\\(> -[^-]\\)\\(.*\\)$"
      (0 'ghpr-review-removed-line t))
     ("^\\(> -\\)$"  ; Handle line with just "> -"
-     (0 'ghpr-review-removed-line t)))
+     (0 'ghpr-review-removed-line t))
+    ("^<.*$"
+     (0 'ghpr-review-existing-review t))
+    ("^>.*$"
+     (0 'ghpr-review-misc-line)))
   "Font lock keywords for ghpr-review-mode.")
 
 (defvar-local ghpr-review-diff-content nil