get rid of space between image blocks

I broke my long image into several chunks to upload into one vertical format, but the problem is that there are space between all of them which looks extremely bad.
I’ve tried the following CSS but it doesn’t work
`.single-post .entry-content img {
margin-bottom: 0px !important;
}
Is there something else I can try?

The page I need help with: [log in to see the link]