This module was tested on 14th April 2020, using Drupal 8.8.5 with Site Studio 6.0.0 using version 8.x-5.8 of the module.
There are no known issues using Webform with Site Studio.
When using a Webform as a block, you can style your form by placing the block inside of a container and then targeting the classes on the form within the style tree on the container element.
Link to the module
The module can be found on Drupal.org here.