@vaadin/vaadin-lumo-styles/src/components/combo-box-overlay.css

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

/**
 * @license
 * Copyright (c) 2017 - 2026 Vaadin Ltd.
 * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
 */
@media lumo_components_combo-box-overlay {
  :host {
    --_vaadin-combo-box-items-container-border-width: var(--lumo-space-xs);
    --_vaadin-combo-box-items-container-border-style: solid;
  }

  #overlay {
    width: var(--vaadin-combo-box-overlay-width, var(--_vaadin-combo-box-overlay-default-width, auto));
  }
}