Update book.py

src/book.py

@@ -305,7 +305,11 @@ class Book:
 
     @classmethod
     def convert_pt_to_px(cls, value):
-        return round(cls.FONT_CONVERT_RATIO * float(value))
+        value = int(value)
+        if value == cls.WORD_DEFAULT_FONT_SIZE:
+            return cls.LAWCARTA_DEFAULT_FONT_SIZE
+        else:
+            return value
 
     @classmethod
     def convert_font_pt_to_px(cls, style):