index.html

<html>
    <head>
        <title></title>
        <script>
            function index()
            {
                document.getElementById("slogin").style.height=20px;
            }
        </script>
        <link rel="stylesheet" type="text/css" href="style.css">
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
    </head>
    <body>
        <div class="header">
            <h1>Hackathon</h1>
        </div>
        <div id="hl"></div>
        <div class="canvas">
            <div class="login">
                <from>
                    <table border="0px" cellpadding="0px">
                        <tr align="center">
                            <td width="50%"><button id="slogin" onclick="index()">Student</button></td>
                            <td width="50%"><input type="button" id="alogin" value="Admin"></td>
                        </tr>
                        <tr>
                            <td colspan="2" width="100%" align="center"><input type="text" id="uid" placeholder="Username"></td>
                        </tr>
                        <tr><td width="100%" colspan="2" align="center"><input type="password" id="pass" placeholder="Password"></td></tr>
                        <tr height="50px">
                            <td align="center" colspan="2">
                                    <button type="button" id="signin" class="btn btn-success">Login</button>
                            </td>
                        </tr>
                    </table>
                </from>
            </div>
        </div>
    </body>
</html>