纯css实现九宫格图片

本篇文章所分享的内容主要涉及到结构伪类选择器，不熟悉的小伙伴可以了解一下，在常用的css选择器中我也有分享相关内容。

话不多说，接下来我们直接上代码：

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .box {
      width: 300px;
      height: 300px;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      position: relative;
    }
    .item {
      position: relative;
      transition: 0.5s;
      height: 100px;
      width: 100px;
      overflow: hidden;
      /* box-shadow: inset 0 0 0 1px #fff; */
      background-size: 300px 300px;
      background-image: url(./images/sc.jpg);
    }
    .item:nth-child(3n + 1) {
      background-position-x: 0;
      left: -20px;
    }
    .item:nth-child(3n + 2) {
      background-position-x: -100%;
      left: 0;
    }
    .item:nth-child(3n) {
      background-position-x: -200%;
      left: 20px;
    }
    .item:nth-child(n + 7) {
      background-position-y: -200%;
      top: 20px;
    }
    .item:nth-child(-n + 6) {
      background-position-y: -100px;
      top: 0;
    }
    .item:nth-child(-n + 3) {
      background-position-y: 0;
      top: -20px;
    }
    .box:hover .item {
      left: 0;
      top: 0;
    }
  </style>
  <body>
    <div class="box">
      <div class="item"></div>
      <div class="item"></div>
      <div class="item"></div>
      <div class="item"></div>
      <div class="item"></div>
      <div class="item"></div>
      <div class="item"></div>
      <div class="item"></div>
      <div class="item"></div>
    </div>
  </body>
</html>

效果展示：