admin.toolbar_search.css in Admin Toolbar 8

#toolbar-item-administration-search-tray {
  padding-left: 1em;
}

#admin-toolbar-search-tab .toolbar-item:before {
  background-image: url('../misc/icons/bebebe/loupe.svg');
}

#admin-toolbar-search-tab .toolbar-item:active:before,
#admin-toolbar-search-tab .toolbar-item.is-active:before {
  background-image: url('../misc/icons/ffffff/loupe.svg');
}

#toolbar-item-administration-search-tray label {
  display: inline-block;
  color: #000000;
  margin-right: .5em;
  font-weight: bold;
}

#toolbar-item-administration-search-tray div.form-item {
  margin: 0.75em 0;
}

#toolbar-item-administration-search-tray input {
  display: inline-block;
  padding: 0.3em 0.4em 0.3em 0.5em;
  font-size: 1em;
}

.ui-autocomplete .ui-menu-item span.admin-toolbar-search-url {
  color: rgba(0, 0, 0, 0.50);
}