Publish CSS style sheet for external EPI?

Site URL: https://bucksreferees.com/appointments

We are a referee society and our appointments, managed via a third-party website (WTR), are published on our page.

Since we moved from our old website to Squarespace the formatting has changed and when I raised this with WTR they explained the following:

Quote

You API is currently configured to access a style sheet at this address

 

https://www.bucksreferees.com/wp-content/plugins/bucks-wtr-style.css

 

But that file no longer exists, hence the format is not being applied. Once you have a new style sheet just let me know the URL and we will apply it.

The guide they sent says:

Quote

The Data Feed

Data is presented in the form of an HTML table. The URL within your iframe command used to retrieve the data can control the data range, and the classes used on the table, tr, and td commands.

Alternatively the data feed can be provided in CSV format so that your web master may apply processing to the raw data.

I was wondering if it's possible to create a .css style sheet and have it published like on the old website, so that I can manually tweak the formatting of the iframe content so it matches what I want?

Hi Joel, did you ever find a solution to this question?