iu-8.x-1.x-dev/templates/blocks/block--primary-menu--menu-block.html.twig

{#
/**
 * @file
 * Override the system menu block to match IU Framework expectations.
 */
#}
<div{{ attributes.addClass('sticky-nav') }}>
  {{ title_prefix }}{{ title_suffix }}
  <nav role="navigation" aria-label=" {{ 'Main navigation'|t }}" id="nav-main" itemscope="itemscope" itemtype="http://schema.org/SiteNavigationElement" class="main show-for-large dropdown">
    <div class="row pad">
    {{ content }}
    </div>
  </nav>
</div>