Fix stylelint issues

Problem/Motivation

The following issues are causing styleline jobs to fail.

css/require_on_publish.css
   2:12  ✖  Replace "''" with """"                                      prettier/prettier
   3:3   ✖  Expected "width" to come before "content"                   order/properties-order
   6:3   ✖  Expected "border-width" to come before "border-style"       order/properties-order
   8:3   ✖  Expected "border-color" to come before "background-color"   order/properties-order
   9:3   ✖  Unexpected shorthand "background" after "background-color"  declaration-block-no-shorthand-property-overrides
  10:3   ✖  Expected "margin" to come before "background"               order/properties-order
  12:3   ✖  Expected "display" to come before "vertical-align"          order/properties-order
✖ 7 problems (7 errors, 0 warnings)

Steps to reproduce

An example may be seen at https://git.drupalcode.org/issue/require_on_publish-3530547/-/jobs/5688812.

Proposed resolution

Fix the reported stylelint issues.