How to horizontally align slides or keep arrows in the middle of slides

So I have a testimonial slider which are all different sizes because some testimonials are longer than others. It looks fine on desktop because I don’t use the arrows. But on mobile I can’t get the arrows to stay in the middle of all the slides since they are all different sizes. Is there some way to horizontally align the slides? Or a way to keep the arrows in the middle of each separate slide?

Screenshots for reference:

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