@vaadin/vaadin-lumo-styles/src/props/reset.css

Lumo is a design system foundation for modern web applications, used by Vaadin components

/**
 * @license
 * Copyright (c) 2000 - 2026 Vaadin Ltd.
 * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
 */

/*
  Reset base style custom properties using the `initial` keyword to ensure
  constructions like var(--vaadin-focus-ring-color, red) correctly resolve
  to the fallback value (red) by default rather than the base style value.
*/
:where(:root),
:where(:host) {
  --vaadin-focus-ring-color: initial;
  --vaadin-focus-ring-width: initial;
}