Recommended Article / Sign Up For Whitepaper block to slide in from left

Site URL: https://blog.hubspot.com/marketing/free-landing-page-templates

As you can see on this Hubspot article, a content box slides in from the left promoting a signup. What's the best way to implement something like this on Squarespace?

Thanks,

You mean effect slide from left?

You can use Promonal Popup + Adjust code to make slide left