Implementation ideas:
(Recommended tutorial: css quick start)
Two divs side by side, in the second Define a div named item with 2 times the width and height, set border-radius: 50% for the item, and then absolutely position it.
Code implementation:
<head>
<meta charset="UTF-8" />
<title>Title</title>
<style>
.box {
width: 50px;
height: 50px;
overflow: hidden;
background: #655;
text-align: center;
position: relative;
float: left;
}
.item {
width: 100px;
height: 100px;
background: #fff;
border-radius: 50%;
position: absolute;
top: -50px;
left: 0;
}
</style>
</head>
<body>
<div class="box"></div>
<div class="box">
<div class="item"></div>
</div>
</body>
</html> Implementation effect:
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