the-example-app-nodejs/assets/stylesheets/global/sidebar-menu.css

.sidebar-menu {
  & ul {
    list-style: none;
    margin: var(--grid-gutter) 0;
    padding: 0;

    & li {
      margin: 0 0 var(--grid-gutter);
      padding: 0;
    }

    & a {
      display: block;

      &.active {
        font-weight: bold;
      }
    }
  }
}