10-fixed.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>


    <style>
        * {
            padding: 0;
            margin: 0;
        }

        body {

            height: 2000px;
        }

        #div1 {


            width: 50px;
            height: 100px;
            background: red;
            margin: 50px;
            position: fixed;
            left: 0;
            top: 300px;

        }


    </style>
</head>

<body>
    <div id="div1">
        111
    </div>
    <p>a6s5d4fasdkfjhaskdjhfglkdjhgasldjfgasjdghf</p>

</body>

</html>