diff --git a/docling/backend/html_backend.py b/docling/backend/html_backend.py
index 9dfbadb6..0894deeb 100644
--- a/docling/backend/html_backend.py
+++ b/docling/backend/html_backend.py
@@ -21,7 +21,12 @@
 
 
 class HTMLDocumentBackend(DeclarativeDocumentBackend):
-    def __init__(self, in_doc: "InputDocument", path_or_stream: Union[BytesIO, Path], skip_furniture:bool=False):
+    def __init__(
+        self,
+        in_doc: "InputDocument",
+        path_or_stream: Union[BytesIO, Path],
+        skip_furniture: bool = False,
+    ):
         super().__init__(in_doc, path_or_stream)
         _log.debug("About to init HTML backend...")
         self.soup = None
@@ -36,7 +41,7 @@ def __init__(self, in_doc: "InputDocument", path_or_stream: Union[BytesIO, Path]
         self.labels = {}  # type: ignore
 
         self.skip_furniture = skip_furniture
-        
+
         try:
             if isinstance(self.path_or_stream, BytesIO):
                 text_stream = self.path_or_stream.getvalue().decode("utf-8")
@@ -84,9 +89,9 @@ def convert(self) -> DoclingDocument:
             for br in self.soup.body.find_all("br"):
                 br.replace_with("\n")
 
-            self.contains_h1 = bool(soup.find('h1')) and self.skip_furniture
+            self.contains_h1 = bool(self.soup.find("h1")) and self.skip_furniture
             self.detected_h1 = False
-                
+
             doc = self.walk(self.soup.body, doc)
         else:
             raise RuntimeError(
@@ -124,7 +129,7 @@ def analyse_element(self, element, idx, doc):
 
         if element.name in ["h1"]:
             self.detected_h1 = True
-            
+
         if element.name in ["h1", "h2", "h3", "h4", "h5", "h6"]:
             if (not self.contains_h1) or (self.contains_h1 and self.detected_h1):
                 self.handle_header(element, idx, doc)