直接代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>菱形</title>
<style>
.box2{
position: relative;
display: inline-block;
flex: 1;
overflow: hidden;
overflow: visible;
}
.box2:after{
position: absolute;
display: inline-block;
width: 20px;
height: 20px;
background: pink;
transform: rotateZ(45deg)skew(30deg,30deg);
margin-top: -14px;
margin-left: -2px;
border: 1px solid rgba(0,0,0,.25);
border-bottom: none;
border-left: none;
/*transform: skew(20deg) rotate(45deg);*/
content: "";
}
</style>
</head>
<body>
<div class="box2"></div>
<div class="box"></div>
</body>
</html>