Help with logo loading screen for Squarespace 7.1

https://www.londonprobuilders.co.uk/ Site Password: LondonPro

Hi all I'd really appreciate help with coding a white loading screen with a central gold transparent logo.

My previous attempt was using this tutorial and I couldn't adapt the code to a static image: https://www.beatrizcaraballo.com/blog/creating-animated-loading-screen-squarespace

Thanks in advance, 

Kandice

If you remove the animation parts of the CSS in that tutorial then it should be static.