gitlabhq/app/assets/stylesheets/themes/ui_basic.scss

/**
 * This file represent some UI that can be changed
 * during web app restyle or theme select.
 *
 */
.ui_basic {
  /*
   * Common styles
   *
   */
  a {
    color: $link_color;
    &:hover {
      text-decoration:none;
      color: $blue_link;
    }
  }

  .app_logo {
    .separator {
      margin-left: 0;
      margin-right: 0;
    }
  }

  .separator {
    float: left;
    height: 60px;
    width: 1px;
    background: white;
    border-left: 1px solid #DDD;
    margin-top: -10px;
    margin-left: 10px;
    margin-right: 10px;
  }
}