css中上下左右居中方法大全

<style>

    /* 方法一 * 通过定位来实现/
  /* .content{
    height: 300px;
    background: #0f0;
    position: relative;
  }
  .conDetail{
    background: red;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
} */
  /* 方法二 * 通过弹性盒模型来实现 */
  /* .content{
    height: 300px;
    background: #0f0;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .conDetail{
    background: red;
  } */
  /* 方法三 */
  /* .content{
    height: 300px;
    background: #0f0;
    width: 100%;
    position: relative;
  }
  .conDetail{
    background: red;
    position: absolute;
    width: 100px;
    height: 100px;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto
  } */

  </style>
  <div class="content">
    <div class="conDetail">

        我是要实现居中对齐的内容
    </div>
  </div>