JSFiddle - React, Tailwind, and code Playground

by liewshirley

HTML

// 改变浏览器尺寸，或者修改内容尺寸可以发现弹框永远居中

<div class="container">
  <div class="dialog">
    <div class="content">内容占位</div>
  </div>
</div>

CSS

.container {
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  /* for IE8 */
  /* background: url(data:image/png;base64,,iVB...g==); */
  /* for IE9+ */
  background: rgba(0, 0, 0, .5);
  text-align: center;
  white-space: nowrap;
  z-index: 99;
}
.container:after {
  content: "";
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}
.dialog {
  display: inline-block;
  vertical-align: middle;
  border-radius: 6px;
  background-color: #fff;
  text-align: left;
  white-space: normal;
}
.content {
    width: 240px;
    height: 120px;
    padding: 20px;
}