<!DOCTYPE html>
<html lang="zn-ch">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>带三角形的气泡框</title>
<style>
.box{
width:300px;
height:300px;
border: 10px solid #0082df;
position: relative;
}
.box::after{
content: "";
position: absolute;
right:60px;
top:300px;
width:0px;
height:0px;
border:30px solid transparent;
border-top: 30px solid #0082df;
}
.box::before{
content: "";
position: absolute;
top:295px;
left:180px;
z-index: 1;
width:0px;
height: 0px;
border: 30px solid transparent;
border-top:30px solid #fff;
}
</style>
</head>
<body>
<div class="box">
</div>
</body>
</html>
