<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
.container{
width: 150px;
height: 100px;
background: blueviolet;
clip-path: polygon(25px 0,100% 0,100% 100%,0 100%,0 25px);
}
</style>
<body>
<div class="container">
</div>
</body>
</html>
