A problem with asynchronous display of elements

Hello,

For a better display of the slider, I added a blue background, which is created using CSS.

The problem is that it appears before the slider itself, so when the page loads, the blue background is there first, then the slider.

It’s a fraction of a second, but you can’t help but notice it.

Is it possible to sync it somehow please?

Thank you

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

 

This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer