Could you add an attribute that would help developers customize the form styles with their own CSS properties. Here is a simple way to implement it.
<script src="https://assets.calendly.com/assets/external/widget.js" type="text/javascript"></script>
<div class="calendly-inline-widget" data-url="https://calendly.com/andry-heyreliable/30min?hide_gdpr_banner=1" style="height:700px;" data-custom-css=”https://testsite.local/custom-styles.css” ></div>
Just simple `data-custom-css` will help to change styles of widget by having more strong priority