Adding a design my night widget code to buttons

Site URL: http://stgileshousenorwich.com

Hello I am trying to add a widget to various buttons for 'book a table' - it is to connect to a website called design my night..I have the code.. I want it to work like this website example - https://www.thegeorgiantownhousenorwich.com

This is the widget code - 

  <link rel="stylesheet" type="text/css" href="https://onsass.designmynight.com/?background-color=%23FFFFFF&primary-color=%236DA8A6&body-text-color=%23000000&outer-border-color=gray"><script src="//widgets.designmynight.com/bookings-partner.min.js" dmn-booking-form="true" venue="6723405b105e4703430135a4" hide-offers="true" hide-powered-by="false" search-venues="false" monday-first="true" locale="undefined" show-type-first="true" return-url="https://www.stgileshousenorwich.com/home" return-method="post"></script>

Please can someone help. Thanks

9 minutes ago, wethreeclub said:

This is the widget code - 

This is a stand-alone widget, you don't need to add it to a button, but to a code block.

I did this on the bottom of our homepage - password is just 'giles' if you want to have a look

But I wanted it to react and work like the website I have sent over..how do I do this?

1 minute ago, wethreeclub said:

But I wanted it to react and work like the website I have sent over..how do I do this?

Are you referring to the button click that opens a full-screen booking experience?

It is the book now button, that then has different options, if you click on it, it creates a lightbox in the middle of the screen..is this possible?

Just now, wethreeclub said:

It is the book now button, that then has different options, if you click on it, it creates a lightbox in the middle of the screen..is this possible?

You would have to check DesignMyNight to see if they have this type of experience as a widget. It's possible in Squarespace but not "powered by Squarespace". If DesignMyNight doesn't have that, then there might be a way with a lightbox plugin if DesignMyNight at least has a full screen embed option.