移动端 css实现自适应正圆 ( 宽高随着手机屏幕宽度自适应 )

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序言：应朋友要求随手写了一下移动端 css实现自适应正圆 ( 宽高随着手机屏幕宽度自适应 ) ，以备后用

LESS代码：

.adaptive-circle {
margin: 50px auto 0;
width: 80%;
height:;
padding-top: 80%; border-radius: 100%;
border: 1px solid #000;
box-sizing: border-box; // for .layout { height: 100%; } position: relative; .layout {
position: absolute;
left:;
top:;
width: 100%;
height: 100%;
overflow: hidden;
text-align: center; &.middle {
&:before {
display: inline-block;
vertical-align: middle; content: '';
height: 100%;
width:;
overflow: hidden;
}
div:first-child {
display: inline-block;
vertical-align: middle;
}
}
}
}

CSS代码：

HTML代码:

<div class="adaptive-circle">
<div class="layout middle">
<div>
<h2>自适应标题</h2>
<p>自适应结束</p>
</div>
</div>
</div>

完整demo代码：

<!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>