diff --git a/docutranslate/exporter/md/md2html_exporter.py b/docutranslate/exporter/md/md2html_exporter.py
index 3345a05..229cb66 100644
--- a/docutranslate/exporter/md/md2html_exporter.py
+++ b/docutranslate/exporter/md/md2html_exporter.py
@@ -24,7 +24,7 @@ class MD2HTMLExporter(MDExporter):
# language=html
pico = f'' if not cdn else r''
html_template = resource_path("template/markdown.html").read_text(encoding="utf-8")
- katex_css = f'' if not cdn else r""""""
+ katex_css = f'' if not cdn else r""""""
katex_js = f'' if not cdn else r""""""
auto_render = f'' if not cdn else r""""""
# language=javascript