Restyle code element, remove docs example overflow, improve docs examples (#25054)

* 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

assets/scss/_component-examples.scss

@@ -118,7 +118,6 @@
   position: relative;
   padding: 1rem;
   margin: 1rem (-$grid-gutter-width / 2);
-  overflow: auto;
   border: solid #f7f7f9;
   border-width: .2rem 0 0;
   @include clearfix();