让div水平居中的7种方法_代码007(未授权)

&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;

&lt;head&gt;
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>模块水平居</title>
  <style>
    /* 父元素设置flex 子元素margin：auto */
    .parent {
      width: 200px;
      height: 200px;
      background-color: aqua;
      display: flex;
      float: left;
    }

    .child {
      width: 100px;
      height: 100px;
      background-color: pink;
      margin: auto;
    }
  </style>
</head>

<body>
  <div class="parent">
    <div class="child"></div>
  </div>
</body>

</html>

.parent2 {
      width: 200px;
      height: 200px;
      display: grid;
      background-color: pink;
    }

    .child2 {
      width: 100px;
      height: 100px;
      background-color: blue;
      margin: auto;
    }

.parent3 {
      width: 200px;
      height: 200px;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: rgb(0, 255, 47);
      float: left;
    }

    .child3 {
      width: 100px;
      height: 100px;
      background-color: pink;
    }

.parent4 {
      width: 200px;
      height: 200px;
      border: 1px solid red;
      background-color: rgb(0, 42, 255);
    }

    .child4 {
      width: 100px;
      height: 100px;
      margin: 50px;
      background-color: pink;
    }

.parent5 {
      width: 200px;
      height: 200px;
      padding: 50px;
      box-sizing: border-box;
      background-color: rgb(225, 255, 0);
    }

    .child5 {
      width: 100px;
      height: 100px;
      background-color: pink;
    }

.parent6 {
      width: 200px;
      height: 200px;
      position: relative;
      background-color: rgb(0, 255, 242);
     
    }

    .child6 {
      width: 100px;
      height: 100px;
      position: absolute;
      top: 0;
      right: 0;
      left: 0;
      bottom: 0;
      margin: auto;
      background-color: pink;
    }

.parent7 {
      width: 400px;
      height: 400px;
      position: relative;
      background-color: rgb(222, 111, 94);
    }

    .child7 {
      width: 200px;
      height: 200px;
      background-color: pink;
      position: absolute;
      top: 50%;
      left: 50%;
      margin-left: -100px;
      margin-top: -100px;
    }