尝试使用css样式

iframe {
  width:100%;
  height:450px;
}

.page iframe {
  width:100%;
  height:450px;
}

有一种方法可以嵌入iframe responsive，这意味着它将占用其容器的全部可用宽度：

.embed-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;  // in case of problems add height: auto; after this line
    overflow: hidden;
    max-width: 100%;
}

.embed-container iframe,
.embed-container object,
.embed-container embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

<div class="embed-container">
    <iframe src="https://www.yourURL.tld" width="560" height="315" frameborder="0"></iframe>
</div>