diff --git a/doc/utils/sphinx-config/conf.py.in b/doc/utils/sphinx-config/conf.py.in
index e4b461397d..073143a7e9 100644
--- a/doc/utils/sphinx-config/conf.py.in
+++ b/doc/utils/sphinx-config/conf.py.in
@@ -208,13 +208,11 @@ html_favicon = '_static/lammps.ico'
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = ['_static',]
 
 # These paths are either relative to html_static_path
 # or fully qualified paths (eg. https://...)
-html_css_files = [
-    'css/lammps.css',
-]
+html_css_files = ['css/lammps.css',]
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied