Extra line space on a mobile

Site URL: https://www.resin-works.com/whatisresinbound

Hi. I have a website with text in three columns that looks fine when viewed on a computer

but when viewed on a mobile, it adds an extra line space where the columns would have ended, so there is an extra line space after paragraph 3 and paragraph 8. I'd imagine that I need to take the padding off the bottom of the text box, but I'm not sure how to get into the coding in order to do that. Any help would be much appreciated.

Thanks

Add to Home > design > custom CSS

/* mobile extra spacing */
@media screen and (max-width:767px) {
div#page-5f789e13c0d2cc549fabcbc9 .html-block {
    padding-bottom: 0 !important;
    padding-top: 0 !important;
}
}

Thank you very much