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-rw-r--r--pyparsing/diagram/__init__.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/pyparsing/diagram/__init__.py b/pyparsing/diagram/__init__.py
index ccad1c5..267f344 100644
--- a/pyparsing/diagram/__init__.py
+++ b/pyparsing/diagram/__init__.py
@@ -145,7 +145,8 @@ def railroad_to_html(diagrams: List[NamedDiagram], embed=False, **kwargs) -> str
continue
io = StringIO()
try:
- diagram.diagram.writeStandalone(io.write)
+ css = kwargs.get('css')
+ diagram.diagram.writeStandalone(io.write, css=css)
except AttributeError:
diagram.diagram.writeSvg(io.write)
title = diagram.name