Badges from sphinx_design have wrong colors

[Stefano David]

Describe the bug

I think there is something fishy going on with badges using the secondary colour.

context
When I create a new project using sphinx_book_theme and sphinx_design, colors of secondary badges seems (is?) wrong

expectation
I expected badges with secondary colour to have a gray background (#6c757d) as defined in sphinx-design (and how it was before I migrated from sphinx-rtd-theme.

bug
The secondary badge instead has an orange background, #ee9040. Moreover, the CSS is defined with !important, which makes it impossible to override.

Reproduce the bug

1. create a new project using
   html_theme = 'sphinx_book_theme'
extensions = ['sphinx design']
2. copy https://github.com/executablebooks/sphinx-design/blob/main/docs/snippets/rst/badge-basic.txt into index.rst
3. build project
4. compare with [1] https://sphinx-design.readthedocs.io/en/alabaster-theme/badges_buttons.html#badges

Note that even if you check [1] and change theme to sbt, badge with secondary colour changes.

And even stranger: on one of my projects, the secondary badges have completely different colours :D

List your environment

The problem arises on debian/devuan/ubuntu using Python 3.11 and relevant packages:

Sphinx==5.3.0 (the version should matter unless it's < 7.0
sphinx-book-theme==1.0.1
sphinx_design==0.5.0

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[Stefano David]

As a workaround, define these rules in your custom CSS (other may be needed, this works on my projects)

.sd-outline-secondary {
    border-color:  #6c757d !important;
}

.sd-text-secondary {
    color:  #6c757d !important;
}

.sd-bg-secondary {
    background-color:  #6c757d !important;
}