Misago/misago/admin/src/style/side-nav.scss

// Side navigation

.col-nav-side {
  max-width: $nav-side-width;
}

.nav-side {
  @extend .flex-column;

  .media-icon {
    width: $nav-side-icon-width;
    text-align: center;
  }

  .media-body {
    @extend .pl-1;
  }

  .nav-link {
    @extend .media;
  }

  .nav-link.active {
    color: $nav-side-link-active-color;

    .media-icon {
      color: $primary;
    }
  }

  .nav-section.active {
    font-weight: $font-weight-bold;
  }

  .nav-action .media-body {
    margin-left: $nav-side-icon-width;
  }
}