Right and left scrollable - overflow fix?

Hey!

I have my site set with a preloader, which seems to cause problems on site.
When the preloader loads, I can scroll the content underneath, which makes it so that if u scroll while it loads, you wont “start” at the top.
Is there a way to run the preloader, and while it loads, you wont be able to scroll the underlying content?
Also, when the site loads, I can also scroll to the left and right on the site, and theres a white space to the right. How do I fix this?

Read only site


Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Hi @Jakob_Hoeg. Here is the answer to your question: Disable scroll until animation is completed - #2 by vincent

Awesome!
Do you also happen to know the answer to my second question?

Show please on screenshot what you mean?