<h2 class="accordion-header">
  <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
    data-bs-target="#flush-heading-Shoppingmall" aria-expanded="false"
    aria-controls="flush-heading-Shoppingmall"><b>상점관리</b></button>
</h2>
<div id="flush-heading-Shoppingmall" class="accordion-collapse collapse show"
  aria-labelledby="panelsStayOpen-heading-Shoppingmall">
  <div class="accordion-item">
    <h2><a href="/admin/device">장비 관리</a></h2>
  </div>
  <div class="accordion-item">
    <h2><a href="/admin/product">상품 관리</a></h2>
  </div>
  <div class="accordion-item">
    <h2><a href="/admin/order">주문 관리</a></h2>
  </div>
  <div class="accordion-item">
    <h2><a href="/admin/billing">청구서 관리</a></h2>
  </div>
</div>