DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>title>
<style type="text/css">
.btn{
width: 150px;
height: 50px;
font-size: 16px;
background-color: green;
border: 0px ;
border-radius: 5px;
}
style>
head>
<body>
<input type="button" class="btn" value="我是圆角按钮"/>
body>
html>
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