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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no">
    <title>移动端 css实现自适应正圆 ( 宽高随着手机屏幕宽度自适应 ) 博客园(杨君华)</title>
</head>
​
<style>
    .adaptive-circle {
        margin: 50px auto 0;
        width: 80%;
        height: 0;
        padding-top: 80%;
​
        border-radius: 100%;
        border: 1px solid #000;
        box-sizing: border-box;
​
        position: relative;
    }
    .adaptive-circle .layout {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        overflow: hidden;
        text-align: center;
    }
    .adaptive-circle .layout.middle:before {
        display: inline-block;
        vertical-align: middle;
​
        content: '';
        height: 100%;
        width: 0;
        overflow: hidden;
    }
    .adaptive-circle .layout.middle div:first-child {
        display: inline-block;
        vertical-align: middle;
    }
</style>
​
<body>
    <div class="adaptive-circle">
        <div class="layout middle">
            <div>
                <h2>自适应标题</h2>
                <p>自适应介绍</p>
            </div>
        </div>
    </div>
</body>
</html>
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