@vaadin/vaadin-lumo-styles/src/components/notification-container.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_notification-container {
  :host {
    position: fixed;
    inset: 0;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    pointer-events: none;

    /* Override native [popover] user agent styles */
    width: auto;
    height: auto;
    border: none;
    padding: 0;
    background-color: transparent;
    overflow: visible;
  }

  [region-group] {
    flex: 1 1 0%;
    display: flex;
  }

  [region-group='top'] {
    align-items: flex-start;
  }

  [region-group='bottom'] {
    align-items: flex-end;
  }

  [region-group] > [region] {
    flex: 1 1 0%;
  }

  @media (max-width: 420px) {
    [region-group] {
      flex-direction: column;
      align-items: stretch;
    }

    [region-group='top'] {
      justify-content: flex-start;
    }

    [region-group='bottom'] {
      justify-content: flex-end;
    }

    [region-group] > [region] {
      flex: initial;
    }
  }
}