Problems with Gin Admin theme

Problem/Motivation

This module is great, but it it doesn't appear to work as well on sites that use the Gin admin theme. Notably:
- The left navigation doesn't stay fixed as you scroll down
- Clicking on an item in the left navigation doesn't take you to the corresponding part of the documentation

I didn't see any errors logged in the Javascript console.

Steps to reproduce

On a headless site using this module, change the admin theme to Gin, and then visit the Redoc

Proposed resolution

Gin uses somewhat different markup, so I suspect it's a question of updating JS selectors.