drupal/core/modules/toolbar/css/toolbar.menu.css

/**
 * @file toolbar.menu.css
 */
.toolbar .toolbar-menu,
[dir="rtl"] .toolbar .toolbar-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}
.toolbar .toolbar-box {
  display: block;
  line-height: 1em; /* this prevents the value "normal" from being returned as the line-height */
  position: relative;
  width: auto;
}

/**
 * Hidden vertical toolbar sub-menus by default.
 */
.toolbar .toolbar-tray-vertical .toolbar-menu ul {
  display: none;
}

/**
 * Hidden horizontal toolbar handle icon.
 */
.toolbar .toolbar-tray-horizontal .toolbar-menu .toolbar-handle {
  display: none;
}
/**
 * Hidden toolbar sub-menus by default.
 */
.toolbar-tray-open .toolbar-menu .menu-item--expanded ul {
  display: none;
}
.toolbar .toolbar-tray-vertical li.open > ul {
  display: block; /* Show the sub-menus */
}
.toolbar .toolbar-tray-vertical .toolbar-handle + a {
  margin-right: 3em; /* LTR */
}
[dir="rtl"] .toolbar .toolbar-tray-vertical .toolbar-handle + a {
  margin-left: 3em;
  margin-right: 0;
}
.toolbar .toolbar-tray .menu-item--active-trail > .toolbar-box a,
.toolbar .toolbar-tray a.is-active {
  color: #000;
  font-weight: bold;
}

/* ----- Toolbar menu tray for viewports less than 320px ------ */
@media screen and (max-width: 319px) {
  .toolbar .toolbar-tray-vertical.is-active {
    width: 100%;
  }
}

/**
 * Items.
 */
.toolbar .level-2 > ul {
  background-color: #fafafa;
  border-bottom-color: #cccccc;
  border-top-color: #e5e5e5;
}
.toolbar .level-3 > ul {
  background-color: #f5f5f5;
  border-bottom-color: #c5c5c5;
  border-top-color: #dddddd;
}
.toolbar .level-4 > ul {
  background-color: #eeeeee;
  border-bottom-color: #bbbbbb;
  border-top-color: #d5d5d5;
}
.toolbar .level-5 > ul {
  background-color: #e5e5e5;
  border-bottom-color: #b5b5b5;
  border-top-color: #cccccc;
}
.toolbar .level-6 > ul {
  background-color: #eeeeee;
  border-bottom-color: #aaaaaa;
  border-top-color: #c5c5c5;
}
.toolbar .level-7 > ul {
  background-color: #fafafa;
  border-bottom-color: #b5b5b5;
  border-top-color: #cccccc;
}
.toolbar .level-8 > ul {
  background-color: #dddddd;
  border-bottom-color: #cccccc;
  border-top-color: #dddddd;
}

/**
 * Handle.
 */
.toolbar .toolbar-handle:hover {
  cursor: pointer;
}
.toolbar .toolbar-icon.toolbar-handle {
  bottom: 0;
  display: block;
  height: 100%;
  padding: 0;
  position: absolute;
  right: 0; /* LTR */
  top: 0;
  z-index: 1;
}
[dir="rtl"] .toolbar .toolbar-icon.toolbar-handle {
  left: 0;
  padding: 0;
  right: auto;
}