<!DOCTYPE html>
<html>
<head>
    <style>
        .box {
            width: 100px;
            height: 100px;
            background-color: blue;
        }
        
        .fixed {
            position: fixed;
            top: 0;
            left: 0;
        }
    </style>
</head>
<body>
    <div class="fixed box"></div>
</body>
</html>