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Remove white area from multi column slider

Hi guys,
here is my slider:
https://amusantly.webflow.io/slider

if you click on the arrow to the right couple of times you will see the white area in the end. it is because the mask is set to 40% of the screen, since I would like just 2 columns to scroll per click.

so then it plays against me and in the end no matter how many slides I add there is still this white area.

do you know how I could fix it?

thank you

Here is my public share link: Webflow - AMUSANTLY