填写缺少的部分以创建带有页眉、内容和页脚的卡片:
<div class="@(4)">
<div class="@(11)">Header</div>
<div class="@(9)">Content</div>
<div class="@(11)">Footer</div>
</div>
<div class="card">
<div class="card-header">Header</div>
<div class="card-body">Content</div>
<div class="card-footer">Footer</div>
</div>