CSS element vertically centered-CSS Tutorial-php.cn

CSS element vertically centered

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Release： 2021-04-15 13:59:41

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CSS element vertically centered

The troublesome problem with CSS is vertical centering. There are several ways to achieve vertical centering, but each method has certain limitations, so vertical centering can be used according to actual business scenarios.

1. The content in the container is only one line of text

<!DOCTYPE html>
<html>
  <style>
    * {
      padding: 0;
      margin: 0;
    }
    div {
      height: 60px;
      background-color: #1888fa;
      color: white;
    }
    span {
      line-height: 60px;/* 设置一个大的行高，让它等于理想的容器高度。
      这样会让容器高度扩展到能够容纳行高。如果内容不是行内元素，可以设置为inline-block。 */
    }
  </style>
  <body>
    <div>
      <span>测试</span>
    </div>
  </body>
</html>

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2. The container is natural Height

The simplest vertical centering method in CSS is to give the container equal top and bottom padding, allowing the container and content to determine their own height. See the example below, which vertically centers the content in the parent container by setting padding-top and padding-bottom to equal values.

<!DOCTYPE html>
<html>
   <style>
      * {
        padding: 0;
        margin: 0;
      }
      div {
        padding-top: 20px;  
        padding-bottom: 20px;
        background-color: #1888FA;
        color: white;
      }
    </style>
    <body>
      <div>
         <span>测试</span>
      </div>
    </body>
</html>

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3. Use FlexBox

<!DOCTYPE html>
<html>
  <style>
    * {
      padding: 0;
      margin: 0;
    }
    div {
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      background-color: #1888fa;
      color: white;
    }
  </style>
  <body>
    <div>
      <span>测试</span>
    </div>
  </body>
</html>

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