I can only define the place in the layout and Elementor changes the size of the container according to the display type. In some cases, on mobile, Elementor shows only one column instead of 2 or 3 and then in some cases the area, where the cards are shown, is wider.
When I started to define the image size in WPSP I took the resolution how the images are scaled on desktop. But on mobile it is different.
To solve the problem I use now a bigger image resolution and I hope this will work now.