<!DOCTYPE html>
<html>
<head>
<style>
p{
position:relative;
}
p:before
{
content:"";
position:absolute;
top:0;
left:0;
width:50px;
height:50px;
border-radius:0 0 50px 0;
-webkit-border-radius:0 0 50px 0;
background:#e7effc;
}
</style>
</head>
<body>
<p></p>
</body>
</html>
椭圆即把width或者height改变即可
例如：
p:before
{
content:"";
position:absolute;
top:0;
left:0;
width:100px;
height:50px;
border-radius:0 0 50px 0;
-webkit-border-radius:0 0 50px 0;
background:#e7effc;
}
