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+<!DOCTYPE html>
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+<html lang="en">
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+
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ /* css reset */
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+ * {
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+ margin: 0;
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+ padding: 0;
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+ }
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+
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+
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+ .fullscreen-container {
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+ /* height: 100vh;
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+ width: 100vw; */
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+ background-color: #f0f4c3;
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+ position: fixed;
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+ top: 0;
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+ left: 0;
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+ right: 0;
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+ bottom: 0;
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+ }
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+ .bubble-container{
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+ width: 500px;
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+ height: 600px;
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+ background-color: #fff;
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+ z-index: 1000;
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+ position: fixed;
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+ top: 50%;
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+ left: 50%;
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+ margin-top: -300px;
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+ margin-left: -250px;
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+ padding: 20px;
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+ box-sizing: border-box;
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+ }
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+ .bottom-info{
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+ /* 如果块元素定位后fixed 和 absolute宽度会变成内容的宽*/
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+ position: fixed;
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+ bottom: 0;
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+ left: 0;
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+ height: 50px;
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+ width: 100%;
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+ text-align: center;
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+ line-height: 50px;
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+ color: #b28704;
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+ background-color: #fffde7;
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+ }
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+ .bubble-container .text{
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+ text-align: center;
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+ }
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+ .bubble-container .text h1{
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+ color: #689f38;
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+ margin:20px 0;
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+ }
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+ .bubble-container .text .info {
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+ width: 300px;
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+ margin: 0 auto;
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+ }
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+ .bubble-container .text .desc {
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+ font-size: 12px;
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+ color: #999;
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+ margin-top: 20px;
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+ }
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+ .bubble-container .bubble-content{
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+ width: 100%;
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+ height: 380px;
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+ background-color:#b2dfdb;
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+ margin-top: 20px;
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+ border-radius: 20px;
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+ }
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+ </style>
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+</head>
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+
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+<body>
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+ <!-- 全屏容器 -->
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+ <div class="fullscreen-container"></div>
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+ <!-- 定位气泡容器 -->
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+ <div class="bubble-container">
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+ <div class="text">
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+ <h1>趣味气泡 Position 练习</h1>
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+ <p class="info">任务： 观察并理解气泡的定位方式，鼠标悬停气泡试试看！</p>
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+ <p class="desc">（气泡用 absolute，气泡区用 relative，底部说明条用 fixed）</p>
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+ </div>
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+ <div class="bubble-content"></div>
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+ </div>
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+ <!-- 底部信息 -->
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+ <div class="bottom-info">本页面用于练习 position: relative / absolute / fixed 及 hover/伪元素效果</div>
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+</body>
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+
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+</html>
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