<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        body,html{
            height:100%;
            width:100%;
        }
        .c1{
            margin-left: 100px;
            height:60%;
            width: 80%;
        }
    </style>
</head>
<body>
<div class="c1"></div>
</body>
</html>