graphql-engine/docs/_theme/djangodocs/pages/loading.html

<div class="loading_overlay hide">
  <div class="loader"></div>
  <div class="subhead_wrapper_loader body_content_position">Loading...</div>
  <div class="overlay_wrapper"></div>
</div>


<script type="text/javascript">
  const showLoading = function() {
    $('.loading_overlay').removeClass('hide');
  };

  const hideLoading = function() {
    $('.loading_overlay').addClass('hide');
  };
</script>