how to make a gallery from a plugin have blur fit for images instead of zoom fit

I really liked smartslider 3 but its too heavy to load especially if i’m making 5-6 different galleries each with 60-80 images

i use Elementor to build the website and i found a plugin called unlimited elements from which they have some simple galleries but all are missing 1 thing

1- blur fit. and what that does is it fits all photos to the frame of the gallery without zooming in on the vertical shots to make them fit and blurs out the sides with the same image

i really want to know how i can i add this effect to the galleries in unlimited elements since they are editable with HTML or CSS. i tried copying the strings from the inspection window on smart slider 3 but nothing worked and its making me pull my hair.