利用border-radius将标签设置成圆形，只要将border-radius的值设置成50%
<html>
<head>
</head>
<body style="width: 99%;height: 1000px;">
<div style="width:100px;height:100px;background-color:#000000;border-radius:50%;"></div>
<input type="button" style="width: 100px;height: 100px;background-color: #000000;border-radius:50%;" />
</body>
</html>
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