Change loading background colour 7.1

Site URL: https://sealion-aqua-6cgh.squarespace.com

Password: PartTwoDesign

Is there a way within the Site Styles to change the loading background colour of each page?

For a split second, when clicking through my site's pages, it seems to load the darker grey (part of my colour palette)... why is this? 

TIA,

Anna

This is because your dark grey theme is set as your default theme. You can change which theme is the default in the Squarespace App. This will also change the background colour of your search page and shopping cart page. 

Thank you @rebeccagracedesigns!!! I'd never have found this. How bizarre that you can only do this via the mobile app - Squarespace really need to add this to desktop too 🤯

Here are the instructions for anyone following this post -