diff --git a/src/config.py b/src/config.py
index 14cd5e5..8937b6e 100644
--- a/src/config.py
+++ b/src/config.py
@@ -89,6 +89,7 @@ class LawCartaConfig:
         '#800000': '#800000',
         '#808080': '#808080'
     }
+    INDENT = '30px'
 
 
 class BookApiWrapper:
diff --git a/src/html_preprocessor.py b/src/html_preprocessor.py
index 3298004..109b4e8 100644
--- a/src/html_preprocessor.py
+++ b/src/html_preprocessor.py
@@ -180,7 +180,7 @@ class HTMLPreprocessor:
 
             if indent is not None:
                 indent = indent.group(1)
-                style += f'text-indent: {indent}in;'
+                style += f'text-indent: {LawCartaConfig.INDENT};'
 
             if style:
                 p.attrs['style'] = style