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Parallax issue on Firefox and Safari but no issue on Chrome!

Hey everyone! :slight_smile:
I’m currently designing a website for an agency, and I am having trouble with the background parallax on different browsers. I have one bigger and a smaller problem.
The bigger is: after the publish (I am working on a Mac to clear things out :smiley: ) the parallax is not working on Firefox and lagging on Safari but works fluidly on Chrome!
Do you have any idea how to fix this or is there any better solution for the bg parallax which is working perfectly on different browsers?
The smaller issues would be that when I created the parallax animation on the hero part one beautiful (it’s not…) 1-pixel hight black line appeared at the bottom of my background parallax section and I can not delete or hide only if I delete the animation… :frowning:

Thanks a lot in advance and have a great day/night :slight_smile:

Here is my site Read-Only: IQL Business Page
(how to share your site Read-Only link)