html_css_files (Sphinx conf.py)
https://www.sphinx-doc.org/ja/master/usage/configuration.html#confval-html_css_files
The entry must be a filename string or a tuple containing the filename string and the attributes dictionary.
The filename must be relative to the html_static_path, or a full URI with scheme like https://example.org/style.css.
URLも渡せる
linkタグができる！
<link rel="stylesheet" type="text/css" href=" html_css_files に渡したURLの1つ " />
👉HTML linkタグ
HTMLテーマに独自のCSS/JSファイルを読み込ませてデザイン調整等したいで知った