Currently the 3.12 docs are built with Sphinx 4.5.0 (it's shown in the page footer) and 3.13 with Sphinx 6.2.0.

Compare these pages in dark mode:

• https://docs.python.org/3.12/library/asyncio-task.html
• https://docs.python.org/3.13/library/asyncio-task.html

Python 3.12 / Sphinx 4.5.0	Python 3.13 / Sphinx 6.2.0

Looks fine in light mode:

Python 3.12 / Sphinx 4.5.0	Python 3.13 / Sphinx 6.2.0

Previously, we had this CSS frompydoctheme_dark.css applied to<div>:

div.topic,div.note {background-color:rgba(255,255,255,0.1);border-color: currentColor;}

But now the HTML structure has changed to<nav> so the CSS doesn't apply.

Thesource RST:

.. contents::   :depth: 1   :local: