CSS实例

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="UTF-8">
  <meta http-equiv="x-ua-compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>圆形的头像示例</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      background-color: #eeeeee;
    }
    .header-img {
       150px;
      height: 150px;
      border: 3px solid white;
      border-radius: 100%;
      overflow: hidden;
    }
    .header-img>img {
      max- 100%;
    }
  </style>
</head>
<body>

<div class="header-img">
  <img src="https://q1mi.github.io/Blog/asset/img/head_img.jpg" alt="">
</div>

</body>
</html>

圆形头像实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>滚动背景图示例</title>
    <style>
        * {
            margin: 0;
        }
        .box {
             100%;
            height: 500px;
            background: url("https://www.luffycity.com/static/img/width-bank.1c9d1b0.png") no-repeat center center;
            background-attachment: fixed;
        }
        .d1 {
            height: 500px;
            background-color: tomato;
        }
        .d2 {
            height: 500px;
            background-color: steelblue;
        }
        .d3 {
            height: 500px;
            background-color: mediumorchid;
        }
    </style>
</head>
<body>
    <div class="d1"></div>
    <div class="box"></div>
    <div class="d2"></div>
    <div class="d3"></div>
</body>
</html>

背景图片固定不动

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原文地址：https://www.cnblogs.com/jiangchunsheng/p/8625808.html