diff --git a/src/epub_converter/css_preprocessing.py b/src/epub_converter/css_preprocessing.py
index 11e4a16..96959d6 100644
--- a/src/epub_converter/css_preprocessing.py
+++ b/src/epub_converter/css_preprocessing.py
@@ -47,8 +47,8 @@ def convert_tag_style_values(size_value: str) -> str:
     has_style_attrs = re.search(font_size_regexp, size_value)
     if has_style_attrs:
         if has_style_attrs.group(1):
-            size_value = float(size_value.replace("%", "")) / 100.0
-            return find_closest_size(size_value)
+            size_value = float(size_value.replace("%", ""))*6
+            return str(size_value)+'px'
         elif has_style_attrs.group(3):
             size_value = float(size_value.replace("em", ""))
             return find_closest_size(size_value)