Remove unused CSS

Hi,
I’m hoping you can help me. Using Google page insights the first issue is Remove unused CSS, and it’s citing this file:
https://www.mytechsense.com.au/wp-content/cache/breeze-minification/css/breeze_dbcb1a5d447126966cfa76709efc8c58.css

… can you please let me know how to resolve?
Thank you, Annie

The page I need help with: [log in to see the link]