Project - Notification -Create a Button which on click redirects to that sepcific approval.

[Trupti Krishnam]

I have a notification which runs when the project state is Screening and Approval is requested (Here the approval will also be assigned to - to whom ever the project is assigned) .and it is sent to Assigned to Now on this notification I have to create a Button called 'View Approval Task'  which on click it should redirect to that 

Specific Approval task  Something like the below image 

I did tried by creating a below mail script but it's not working

var message = 'View Approval Task';

    var backgroundColor = 'background-color: #152456;';

    var color = 'color: #ffffff; font-weight: bold;';

    var fontSize = 'font-size: 12px;';

    var fontBold = 'font-weight: bold;';

    var fontFamily = 'font-family: trebuchet ms, geneva;';

    var textDecoration = 'text-decoration: none; border-radius: 2px; text-align:center;';

    var display = 'display: inline-block;';

    var padding = 'padding: 10px 20px;';

    var app = new GlideRecord('sysapproval_approver');

    app.addQuery('sysapproval', current.sys_id);

    app.addQuery('state', 'requested');

    app.orderByDesc('sys_created_on');

    app.query();

        if (app.next()) {

            template.print('<a href="' + link + '"');

            template.print('style="' + backgroundColor + color + fontSize + fontBold + fontFamily + textDecoration + display + padding);

            template.print('">');

            template.print(message);

            template.print('</a>');

        }

but it's not working