Theme CSS update is needed for Sphinx 4.0.1

[outoftardis]

Describe the bug

After upgrading Sphinx to version 4.0.1, I've noticed a change in styles. In this issue in michaeljones/breathe repository I was told that it is not a bug on Sphinx/breathe side but rather an intentional change in the new version of Sphinx, and that css should be fixed on the theme side.

Here's what the breathe output looks like with Sphinx 4.0.1 and sphinx-book-theme 0.1.0. If you compare it with the output produced with the earlier version of Sphinx, you'll see that all the code highlighting is missing:

Expected behavior

With Sphinx==3.5.4 and sphinx-book-theme 0.1.0 the output looks like this:

To reproduce

The example (rst/header) is taken directly from the breathe documentation.

Environment

• Python Version: 3.6.9
• Operating System: Ubuntu
• breathe==4.30.0
• sphinx-book-theme==0.1.0

[welcome]

Thanks for opening your first issue here! Engagement like this is essential for open source projects! 🤗

If you haven't done so already, check out EBP's Code of Conduct. Also, please try to follow the issue template as it helps other community members to contribute more effectively.

If your issue is a feature request, others may react to it, to raise its prominence (see Feature Voting).

Welcome to the EBP community! 🎉

[choldgraf]

this one is resolved!