@vaadin/vaadin-lumo-styles/src/components/list-box.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_list-box {
  :host {
    display: flex;
    -webkit-tap-highlight-color: transparent;
    --_lumo-item-selected-icon-display: var(--_lumo-list-box-item-selected-icon-display, block);
  }

  :host([hidden]) {
    display: none !important;
  }

  [part='items'] {
    height: 100%;
    width: 100%;
    overflow-y: auto;
  }

  /* Dividers */
  [part='items'] ::slotted(hr) {
    height: 1px;
    border: 0;
    padding: 0;
    margin: var(--lumo-space-s) var(--lumo-border-radius-m);
    background-color: var(--lumo-contrast-10pct);
  }
}