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

{#
/**
 * @file
 * Override the system menu block to match IU Framework expectations.
 */
#}
<div{{ attributes }}>
  {{ title_prefix }}{{ title_suffix }}
  <nav class="mobile off-canvas-list" role="navigation" aria-label="Mobile navigation" itemscope="itemscope" itemtype="http://schema.org/SiteNavigationElement">
    {{ content }}
  </nav>
</div>