<!DOCTYPE html>
<html >
<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>
<style>
.wrap{
width: calc(300px - 50px);
height: 200px;
padding-right: 50px;
background-color: red;
}
</style>
</head>
<body>
<div class="wrap"></div>
</body>
</html>