1. move a couple of them before the more specific ones.
2. change nesting to be under the same parent selector
3. use the ampersand more

The option is set to `always-single-line` in stylelint-config-standard which we extend.

The images are PNG 8-bit optimized with optipng, zopflipng and pngout.

* Fix for right padding in dismissible alerts

* Removed extra whitespace

* Update _alert.scss

* Update _alert.scss

Merge branch 'custom-checkboxes-radios-correct-color' of https://github.com/sabrown84/bootstrap into sabrown84-custom-checkboxes-radios-correct-color

We don't change anything so the transition is basically unused.

* add margin-bottom to .btn of a vertical button group

* match margins of radio/checkbox buttons in a btn-group to the actual buttons

* add comment

This also fixes the wrong usage of `site.description` instead of `page.description` in meta description.

This saves a few bytes from the unminified dist files.

If the content of the page does not extend the full viewport height, the sidebars were shortened.

Reduce z-indexes in button-group, input-group, list-group, and pagination to the minimum necessary (#24315)

These were using `z-index: 2` to "Place active items above their
siblings for proper border styling". However, using `z-index: 1` is
sufficient for accomplishing that goal.

In input-group, there were also three `z-index: 3` rules for the
hover/focus/active states. I reduced these to `z-index: 2` since they
just needed to be "one more than normal" (i.e. one more than what is now
`z-index: 1` after my changes).

These changes can be verified by viewing the documentation pages for
Button group, Input group, List group, and Pagination before and after
this commit and observing that the active elements are still "above"
their siblings, so their borders look correct.

As the diff shows, this was for a Firefox Android issue that's since been fixed.

Closes #23817.

Rationale: the page is not available locally, only on gh-pages, thus leading to a 404 locally.

also pushed a hotfix to gh-pages branch