add Div to html


I want to add a Div Class to the wordpress theme, so i have for this example the right ‘button’ next to ‘bekijk meer!’
i have added some CSS code and it works, now i only need to paste this line of code:

It is highlighted in the picture.

So the right button next to Bekijk meer!, appears on the website.
This is made in the console of firefox



You can edit this file, /wp-content/plugins/shapely-companion/inc/widgets/widget-home-parallax.php in line #85 you will see the second button code, you can add a third button there, be caution about the edits, backup the file before edit and edit it correctly, add like this,

<?php echo '<a class="btn btn-lg btn-filled" href="#">' ?>

Let us know,