figure not centered in html

[kiwichris]

Describe the bug

I have just updated to sphinx 5.1.1 on FreeBSD 13.1 and the figures in the HTML output for the RTEMS documentation are not centered. The figures are centered in the PDF output.

A ReST example of an image is .. https://git.rtems.org/rtems-docs/tree/user/exe/executables.rst#n37.

The image is centered in our public builds which still use sphinx 3.1.2 .. https://docs.rtems.org/branches/master/user/exe/executables.html

I have removed all styles we have and the issue is still present.

The <figure..> has class="align-center" however the <img ... > it contains does not. Manually adding class="align-center" to the <img ... > with the Inspector tool centered the image. The figure caption also in the <figure..> block is not centered.

How to Reproduce

$ pip install sphinx
$ pip install sphinxcontrib-bibtex
$ git clone git://git.rtems.org/rtems-docs.git
$ cd rtems-docs
$ ./waf configure
$ ./waf

Expected behavior

The figure is centered.

Your project

https://docs.rtems.org/

Screenshots

No response

OS

FreeBSD 13.1

Python version

3.9.13

Sphinx version

5.1.1

Sphinx extensions

sphinxcontrib-bibtex

Extra tools

Firefox, Chrome on MacOS

Additional context

No response