I want to add space between two slick carousel items, but not want the space with padding, because it\'s reducing my element size(and I don\'t want that).
Since the latest versions you can simply add a margin to your slides:
margin
.slick-slide { margin: 0 20px; }
There's no need for any kind of negative margins, since slick's calculation is based on the elements outerHeight.
outerHeight