<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>太极图</title>
<style>
body {
margin: 0;
}
/* 大圈 */
.box1 {
position: relative;
width: 500px;
height: 500px;
margin: 20px auto;
border: 1px solid black;
border-radius: 50%;
box-sizing: border-box;
overflow: hidden;
}
/* 分割为左右两块 */
.box1::before,
.box1::after {
position: absolute;
content: '';
width: 250px;
height: 500px;
}
.box1::before {
left: 0;
background-color: #000;
}
.box1::after {
right: 0;
background-color: #fff;
}
/* 中圈 */
.box2,
.box3 {
position: absolute;
width: 250px;
height: 250px;
left: 50%;
margin-left: -125px;
border-radius: 50%;
box-sizing: border-box;
z-index: 1;
}
.box2 {
top: -1px;
background-color: #000;
}
.box3 {
bottom: 0;
background-color: #fff;
}
/* 小圈 */
.box2::after,
.box3::after {
position: absolute;
top: 50%;
left: 50%;
margin-top: -25px;
margin-left: -25px;
content: '';
width: 50px;
height: 50px;
border-radius: 50%;
}
.box2::after {
background-color: #fff;
}
.box3::after {
background-color: #000;
}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
<div class="box3"></div>
</div>
</body>
</html>
img.jpg
