Increasing Code Block Height - Schedulicity's Website Scheduling Widget

Site URL: https://parrotfish-prism-sd2e.squarespace.com/appointments

I am working on this page:

https://parrotfish-prism-sd2e.squarespace.com/appointments

It is a beauty clinic that wishes to display its Schedulicity booking page from within Squarespace.

I went into their Schedulicity profile and I am inserting the following code from Schedulicity's Website to embed their Scheduling Widget into a code block:

<script type="text/javascript" src="https://api.schedulicity.com/public/widget/CNN5S9/embed"></script>

The code block creates the desired 'portal' to the following Schedulicity's profile:

https://www.schedulicity.com/scheduling/cnn5s9/services

However when it is displayed on the website, the height of the Code Block seems to be too short, resulting in a scroll page within the Squarespace's scroll page. 

How can I put in either custom CSS or additional code into the block to force Squarespace to display the Scheduling Widget as a longer block?