Hi,
You can create a custom preloader to your WordPress by following these steps:
1: Add HTML and CSS for loading overlay (CSS tweaks)
2: Add and style our default content
3: Add preloader transition
4: Order of the animations
5: Fine-tuning for it
If you don't understand then start a chat so that I can make it ASAP.
I have also a 100% success rate of WordPress websites as mentioned in my profile.
I assure that you'll experience a WOW factor by working with us.
So, let's have a chat to figure it out.
Regards,
Alex
Senior WordPress Developer
Solaris Technologies.