<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>CSS实现消息框中带阴影效果的三角形箭头</title>
<style>
.box {
position: relative;
width: 600px;
height: 400px;
background: #fff;
border: 1px solid #ccc;
box-shadow: 2px 2px 2px #ccc;
}
.box:after {
position: absolute;
display: inline-block;
top: 380px;
left: 300px;
width: 0;
height: 0px;
content: '';
border-style: solid;
border-width: 20px;
border-color: #fff #fff transparent transparent;
transform: rotate(135deg);
box-shadow: 2px -2px 2px #ccc;
}
</style>
</head>
<body>
<div class="box">
</div>
</body>
</html>
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