Civi 5.12.1 renders Quicksearch unreadable on Drupal 8
This is a regression that comes when upgrading from CiviCRM 5.12.0 to 5.12.1 on D8 - the Quicksearch text becomes off-white (RGB: 221, 221, 221) (see screenshot):
This is regardless of whether Shoreditch is installed or not.
The CSS that causes this is
normalize.css, part of the normalize-css package which Drupal 8 ships with core.
I think the solution is to explicitly set the color of the Quicksearch input.