diff --git a/src/guiguts/tools/pphtml.py b/src/guiguts/tools/pphtml.py
index 14ed6e15..879cc51e 100644
--- a/src/guiguts/tools/pphtml.py
+++ b/src/guiguts/tools/pphtml.py
@@ -1136,12 +1136,9 @@ def find_defined_css(self) -> None:
             line = re.sub("  +", " ", line)
             line = line.strip()
             for a_class in line.split(" "):
-                # Classes that are not pseudo-classes
-                if (
-                    a_class.startswith(".")
-                    and ":" not in a_class
-                    and a_class[1:] not in self.defined_classes
-                ):
+                # Strip pseudo-class, like ".abc::first-letter"
+                a_class = re.sub(":.+", "", a_class)
+                if a_class.startswith(".") and a_class[1:] not in self.defined_classes:
                     self.defined_classes[a_class[1:]] = self.find_defined_class(
                         a_class[1:]
                     )