Marquee responsive

Hi, I want to add a marquee effect to my website. I have followed tutorial and can get it working but then when I change screen size it breaks.

Can someone point me to a tutorial on how to do this and make it fluid to different screen sizes?
Also, can someone explain to me the principal of why this isn’t working. I am assuming I need to make sure all of the unit sizes I am using are fluid or something. Maybe I even need custom code.

Thanks!


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