@vaadin/vaadin-lumo-styles/src/components/side-nav.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/
 */
@media lumo_components_side-nav {
  :host {
    display: block;
    font-family: var(--lumo-font-family);
    font-size: var(--lumo-font-size-m);
    font-weight: 500;
    line-height: var(--lumo-line-height-xs);
    color: var(--lumo-body-text-color);
    -webkit-tap-highlight-color: transparent;
    --_focus-ring-color: var(--vaadin-focus-ring-color, var(--lumo-primary-color-50pct));
    --_focus-ring-width: var(--vaadin-focus-ring-width, 2px);
  }

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

  button {
    display: flex;
    align-items: center;
    justify-content: inherit;
    width: 100%;
    margin: 0;
    padding: 0;
    background-color: initial;
    color: inherit;
    border: initial;
    outline: none;
    font: inherit;
    text-align: inherit;
  }

  [part='children'] {
    padding: 0;
    margin: 0;
    list-style-type: none;
  }

  [part='label'] {
    display: flex;
    align-items: center;
    width: 100%;
    outline: none;
    box-sizing: border-box;
    border-radius: var(--lumo-border-radius-m);
    font-family: var(--lumo-font-family);
    font-size: var(--lumo-font-size-s);
    font-weight: 500;
    line-height: var(--lumo-line-height-xs);
  }

  [part='label'] ::slotted([slot='label']) {
    color: var(--lumo-secondary-text-color);
    margin: var(--lumo-space-s);
  }

  :host([focus-ring]) [part='label'] {
    box-shadow: 0 0 0 var(--_focus-ring-width) var(--_focus-ring-color);
  }

  [part='toggle-button'] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--lumo-size-s);
    height: var(--lumo-size-s);
    margin-inline: auto var(--lumo-space-xs);
    font-size: var(--lumo-icon-size-m);
    line-height: 1;
    color: var(--lumo-contrast-60pct);
    font-family: 'lumo-icons';
    cursor: var(--lumo-clickable-cursor);
  }

  [part='toggle-button']::before {
    content: var(--lumo-icons-angle-right);
    transition: transform 140ms;
  }

  :host(:not([collapsible])) [part='toggle-button'] {
    display: none !important;
  }

  :host(:not([collapsed])) [part='toggle-button']::before {
    transform: rotate(90deg);
  }

  :host([collapsed][dir='rtl']) [part='toggle-button']::before {
    transform: rotate(180deg);
  }

  @media (any-hover: hover) {
    [part='label']:hover [part='toggle-button'] {
      color: var(--lumo-body-text-color);
    }
  }
}