* added the styling

* added the documentation

* update for one rule per line

* fix hound error: trailing whitespace

* trimmed off vendor prefixes

* Add note about track and thumb

* Psuedo-elements must be split across multiple rulesets to have an affect

* Fix firefox inner focus

* Seems that FF is the only one affected by this

* Add support for gradients

* Add labels, clarify min/max changes

* add step example

* add custom range vars

* set color to `.form-control-plaintext`
* fixes readability on dark themes like ‘darkly’
  * https://bootswatch.com/darkly/index.html#forms
  * https://bootswatch.com/slate/index.html#forms
  * https://bootswatch.com/superhero/index.html#superhero
  * https://bootswatch.com/solar/index.html#forms

/cc @thomaspark

* use $input-bg for $custom-select-bg

Currently bootstrap only provides 4 variations of `width` and `height` css utilities, which are:

1. 25%
2. 50%
3. 75%
4. 100%.

Here, I'm adding `auto` to the list. This is useful when we need to reset the width/height value
back to the browser default value at some point.

When changing `$input-border-width`, `$input-height-border` does not change and `select.form-control` `custom-select` `custom-file` will still have `$input-height` which is resolved from `$input-btn-border-width`

This will work in cases when want controls with border, and buttons without.

Temporary fix will be to override 2 variables

```
$input-border-width: 2px !default;

// which is
// $input-height-border: $input-btn-border-width * 2 !default;
$input-height-border: $input-border-width * 2 !default;
```

* Use `$component-active-bg`, `$component-active-color` in custom-control-indicators and pagination for checked, indeterminate, and active states

* Button and Forms focus colors should be based on `$component-active-bg`

* Deprecate hover media query shim and mixins

Fixes #25195.

This never was completed or fully implemented, and the docs are inaccurate as to what browsers are currently affected by this stickied hover problem. This PR aims to update the docs and deprecate the shim from our mixins and only return the pseudo-classes. To reflect the order of these states used elsewhere (e.g., our button styles), I've also updated the order of each within the mixin.

* Mention in docs and variables that it's deprecated

added variable for the background of checked and indeterminate custom inputs and radios that are disabled
added styles for these cases

* Add min-width to body when printing

This should address some inconsistencies between browsers when printing. It applies a min-width to the body so that the content better resembles what your might see on your screen. I've made it a variable for easy customizing, too.

* Don't underline buttons when printing

* Add basic print styles for page and body size to create a semi-consistent print experience across browsers

- Drops the hover-focus mixin for standard :hover
- Adds explicit :focus styles to match button, input, etc with a box-shadow
- Adjusts z-index values to ensure the layers go initial, hover, active, focus

Fixes #24838.

Closes #23319. Both `.text-muted` and `.btn-outline-secondary` (and indeed all secondary items) make use of `$gray-600`. New value provides a contrast ratio of 4.69.

Closes #24341

- Changes the wrapping label to a div so we can style the label instead of another element while also supporting form validation.
- Fixes form validation styles for custom file input (closes #24831).
- Updates docs with validation styles (also adding example feedback text while I was there) and new how it works section.

Fixes #25016 which noticed a .thead-light and border-color of the .table-border are the same color.

Matches browser default inputs and swaps some max-width properties for a regular width

* Restyle code element, clean up variables

- Removes the padding and background-color
- Changes the color to a brand color ()
- Add new variables to kbd element styles to account for removing the code ones
- Remove overrides that were needed previously

* only break between words, and override it in the pre

* make file inputs 100% wide

* scope custom file changes in input group for sizing

* shorter button labels for responsive

* narrower cards

* button was too wide

* downsize

* fewer links in pagination

* redo cell text

* improve overflow docs

* match layout behaviors

* ditch the indicator as separate element for psuedo-elements on the label

* move disabled to attribute only on input

* redo default inline check to support new markup

* redo inline forms

* clean up vars

* update validation mixin to new structure

* update checks in docs

* linting for for/id attributes

* Add support for size attribute on custom selects

* Add large custom select, document it and the small variant

* fix custom select focus state

* fix custom file input focus styles

* remove empty line

Nav Tabs use single variable to style `$nav-tabs-link-hover-border-color` and `$nav-tabs-link-active-border-color` (#24639)

* converts px valures to rem on tooltip variables

* keep as px to match popover changes

* use `background-color` instead of the shorthand
* use `outline: 0` consistently
* fix transform order
* remove quotes from `SFMono-Regular`