diff --git a/build.py b/build.py
index 2dc06a4..9ce2fa7 100644
--- a/build.py
+++ b/build.py
@@ -53,6 +53,13 @@ def copy_static_files():
       shutil.copy2(source, dest)
 
 
+def copy_style_css():
+  style_source = os.path.join(static_directory, 'style.css')
+  style_dest = os.path.join(output_directory, 'style.css')
+  print_file(style_source, style_dest)
+  shutil.copy2(style_source, style_dest)
+
+
 def find_update_date(text):
   match = re.search(r'^\*?Posted (\d{4}-\d{2}-\d{2})', text, re.MULTILINE)
   if not match:
@@ -227,7 +234,9 @@ def main():
   if args.clean:
     shutil.rmtree(output_directory)
   os.makedirs(output_directory, exist_ok=True)
-  if not args.fast:
+  if args.fast:
+    copy_style_css()
+  else:
     copy_static_files()
   process_markdown_files()
   make_sitemap()