html----实现元素上下左右居中


<body>
  <div id="box">
    <div class="con"></div>
  </div>
</body>

方法1:

<style>
    #box {
      width: 300px;
      height: 200px;
      background: lightpink;
      position: relative;
    }

    .con {
      width: 100px;
      height: 100px;
      background: blue;
      position: absolute; left: 0;
      right: 0;
      top: 0;
      bottom: 0; margin: auto;
    }
  </style>

方法2:

<style>
    #box {
      width: 300px;
      height: 200px;
      background: lightpink;
      position: relative;
    }

    .con {
      width: 100px;
      height: 100px;
      background: blue;
      position: absolute; top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
    }
  </style>

方法3:

<style>
    #box {
      width: 300px;
      height: 200px;
      background: lightpink;
    display: flex; justify-content: center;
      align-items: center;
    }

    .con {
      width: 100px;
      height: 100px;
      background: blue;

    }
  </style>

 


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