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css.html
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css.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div class="box">
</div>
<div class="box1"></div>
<div class="circle"></div>
<style>
.box{
width: 0;
height: 0;
border-bottom: 50px solid red;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 50px solid transparent;
}
.box1{
width: 0;
height: 0;
border-top: 50px solid red;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 50px solid transparent;
}
.circle{
/*width: 400px;*/
/*height:400px;*/
/*border-radius: 100px 100px 0 0;*/
/*border-color: red;*/
width: 200px;
height: 100px;
background-color: red;
border-radius:100px 100px 0 0;/* 左上、右上、右下、左下 */
}
</style>
</body>
</html>