我如何居中一个iframe？

这个问题在这里已经有了答案：

如何在另一个<div>中水平居中<div>？ 82个答案

---

http://codepen.io/mlegg10/pen/zqLdJy改变CSS填充顶部和底部以满足您的需求

/* Flexible iFrame */

.Flexible-container {
  position: relative;
  padding-bottom: 56.25%;
  padding-top: 30px;
  height: 0;
  overflow: hidden;
}
.Flexible-container iframe,
.Flexible-container object,
.Flexible-container embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

<!-- Responsive iFrame -->
<div class="flexible-container">
  <object width="100%" data=""https://drive.google.com/file/d/0BxrMaW3xINrsR3h2cWx0OUlwRms/preview"&amp;toolbar=0&amp;navpanes=0" type="application/pdf">
      <embed width="100%" type="application/pdf" src="https://drive.google.com/file/d/0BxrMaW3xINrsR3h2cWx0OUlwRms/preview"?scrollbar=0&amp;toolbar=0&amp;navpanes=0">
    </object>
</div>

---

display:block + margin:auto;

iframe {
  display:block;
  margin:auto;
}

<iframe></iframe>

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