Padding issues around pictures and how to change fixed pxl sizes

Hi

Im having some issues with the padding on mobile screens. For example as seen on my homepage for example there is significantly more padding in mobile screens then in desktop. Several 100% more in fact. Where do i change the number of pixels in padding so my tables can shrink in size?

Help wanted: I would like to set the number of pixels by myself instead of enfolds automatic numbers.

Best regards
Michael Ostmann