Здраствуйте, так хотели? :
<!DOCTYPE html>
<html lang="en">
<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>Document</title>
</head>
<body>
<div class="block">
<div class="inner"></div>
</div>
</body>
<style>
.block{
width: 450px;
height: 650px;
margin-left: 20px;
overflow-x: hidden;
}
.inner{ background-color: rgb(23, 81, 132);
border-radius: 35px;
transform: skew(8deg);
width: 500px;
margin-left: -100px;
height: 650px;
}
</style>
</html>
с адаптивом разберетесь?
