元素的层级与绝对定位布局


html>
<html lang="en">
<head>
    <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>元素的层级title>
    
    <style>
        .box1{
            width: 200px;
            height: 200px;
            background-color: #bfa;
            position: relative;
            z-index: 1;
        }
        .box2{
            width: 200px;
            height: 200px;
            background-color: red;
            position: absolute;
            left: 50px;
            top: 50px;
            z-index: 2;
        }
        .box3{
            width: 200px;
            height: 200px;
            background-color: yellow;
            position: absolute;
            left: 100px;
            top: 100px;
            z-index: 3;
        }
        .box4{
            width: 100px;
            height: 100px;
            background-color: blue;
            position: absolute;
        }
    style>
head>
<body>
    <div class="box1">div>
    <div class="box2">div>
    <div class="box3">
        <div class="box4">div>
    div>
body>
html>

2、绝对定位布局


html>
<html lang="en">
  <head>
    <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>绝对定位布局title>
    
    <style>
      .box1 {
        background-color: #bfa;
        width: 400px;
        height: 400px;
        position: relative;
      }
      .box2 {
        background-color: red;
        width: 50px;
        height: 50px;
        margin: auto;
        position: absolute;
        left: 0px;
        right: 0px;
        top: 0px;
        bottom: 0px;
      }
    style>
  head>
  <body>
    <div class="box1">
      <div class="box2">div>
    div>
  body>
html>

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原文地址：https://blog.csdn.net/comegoing_xin_lv/article/details/126166846