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垂直居中的方法

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方法一：基于视口（浏览器窗口）的垂直居中

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>垂直居中</title>
  </head>
  <style>
    .wrapper {
      overflow: hidden;
      width: 1000px;
      height: 500px;
      background: #999;
    }
    .center {
      width: 18em;
      height: 10em;
      text-align: center;
      background-color: orange;
      color: #fff;


      /* 1vh = 1% * 视口高度 */
      margin: 50vh auto;
      transform: translateY(-50%);
    }

  </style>
  <body>
    <div class="wrapper">
      <div class="center">
        基于视口的垂直居中<br />
        不要求原生有固定的宽高。<br />
        但是这种居中是在整个页面窗口内居中，不是基于父元素<br />

      </div>
    </div>
  </body>
</html>
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方法二：定宽居

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>垂直居中</title>
  </head>
  <style>
    .center {
      width: 18em;
      height: 10em;
      text-align: center;
      background-color: orange;
      color: #fff;

      position: absolute;
      top: 50%;
      left: 50%;
      margin-left: -9rem;
      margin-top: -5rem;
    }
  </style>
  <body>
    <div class="center">
        要求原生有固定的宽高。<br/>
        position: absolute;<br/>
        top和left 为 50%;<br/>
        margin上为高的一半<br/>
        margin左为宽的一半<br/>
    </div>

  </body>
</html>
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方法三：calc居中

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>垂直居中</title>
  </head>
  <style>
    .center {
      width: 18em;
      height: 10em;
      text-align: center;
      background-color: orange;
      color: #fff;

      position: absolute;
      top: calc(50% - 5em);
      left: calc(50% - 9em);
    }
  </style>
  <body>
    <div class="center">
        要求原生有固定的宽高。<br/>
        position: absolute;<br/>
        top 为 calc(50% 剪 一半高)
        left 为 calc(50% 剪 一半宽)
    </div>

  </body>
</html>
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方法四：transform居中

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>垂直居中</title>
  </head>
  <style>
    .center {
      width: 18em;
      height: 10em;
      text-align: center;
      background-color: orange;
      color: #fff;

      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
    }
  </style>
  <body>
    <div class="center">
        不要求原生有固定的宽高。<br/>
        position: absolute;<br/>
        top和left 为 50%;<br/>
        transform: translate(-50%, -50%);
    </div>

  </body>
</html>
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方法五：flex居中方法一

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>垂直居中</title>
  </head>
  <style>
    .wrapper {
      width: 1000px;
      height: 600px;
      background: #999;

      display: flex;
    }
    .center {
      width: 18em;
      height: 10em;
      text-align: center;
      background-color: orange;
      color: #fff;

      margin: auto;
    }
  </style>
  <body>
    <div class="wrapper">
      <div class="center">
        使用flex居中<br/>
        父元素 display: flex; <br/>
        居中块： margin: auto;
      </div>
    </div>
  </body>
</html>
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方法六: flex居中方法二

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>垂直居中</title>
  </head>
  <style>
    .wrapper {
      width: 1000px;
      height: 600px;
      background: #999;

      display: flex;
      /* 盒子横轴的对齐方式 */
      justify-content: center;
      /* 盒子纵轴的对齐方式 */
      align-items: center;
    }
    .center {
      width: 18em;
      height: 10em;
      text-align: center;
      background-color: orange;
      color: #fff;
    }
  </style>
  <body>
    <div class="wrapper">
      <div class="center">
        使用flex居中<br/>
        父元素 display: flex; <br/>
        justify-content: center;<br/>
        align-items: center;<br/>
      </div>
    </div>
  </body>
</html>