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                <div class="component demo">
  <a href="#collapse-demo" class="btn btn-primary" data-toggle="collapse">
    action link
  <button class="btn btn-primary" data-toggle="collapse" data-target="#collapse-demo">
    action button
  <div class="collapse" id="collapse-demo">
    <div class="card card-body">

<!-- 先創一個卡片,只採用card-body。另在.collapse加入#collapse-demo,在使用摺疊的時候可以呼叫這個#collapse-demo -->
<!-- 這裏有兩個呼叫的按鈕a連結跟button -->
<!-- a連結就採用btn的樣式btn-primary,加入data-toggle="collapse"代表使用折疊的功能以及href="#collapse-demo"呼叫卡片的id -->

<!-- button部分跟a連結差別就在於a連結有href="#collapse-demo",button則另外加入data-target="#collapse-demo" -->

<!-- 這個功能為折疊,也就是滑動的效果將內容呼叫出來。關閉的時候滑動效果隱藏 -->


  padding: 50px;