DSA.html

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

<head>
    <title>Complete RoadMap to DSA</title>
    <style>
        body {
            background-color: #3caea3;
            margin: 10px 10px 10px 10px;
        }

        .button1 {
            color: black;
            font-size: medium;
            border-radius: 8px;

        }
    </style>

</head>

<body>

    <iframe title="DSA" style="border:none" width="1400" height="635"
        src="https://whimsical.com/embed/L7xNuV2ZRSsLd6vrVtyvrQ"></iframe>

    <button class="button1" onclick="goBack()">Go Back</button>

    <script>
        function goBack() {
            window.history.back();
        }
    </script>
</body>

</html>