<!DOCTYPE html>
<html>
<head>
<style>
div
{
border:2px solid;
padding:10px;
background:#dddddd;
border-bottom-left-radius:2em;
}
</style>
</head>
<body>
<div>border-bottom-left-radius 属性允许您向左下角添加圆角边框。</div>
</body>
</html>