My images refuse to resize within my sliders

I’m sure this is something that I’m doing wrong due to a lack of understanding…but I can’t figure it out. If you scroll down to where the title is “Outcomes that addressed the problems,” I have some sliders that I am trying to get them to resize responsively. I want to bring them down to 40% on the tablet view like I was able to get the images in that section to do. However, no matter what I try in resizing the slider or mask, it won’t resize the images within the slider. I have the images as a background image of each of the slides. How can I fix this so I can scale down across the smaller viewports??


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