Mobile template - portfolio titles spacing..?

Site URL: https://www.martinfaltejsek.cz

Hello, I simply did nothing and today I discovered when viewing my website on a phone/tablet, titles in every single portfolio are so far away from each other.  I am not able to fix this via the option "Vertical Link Spacing", it only works for a computer version. Please, does anyone have an idea how to fix this? Here in the attached printscreen is what I mean...Thanks a lot! It has happened out of the blue, so not sure if it's caused by some Squarespace update or what...

Add to Home > Design  > Custom CSS

@media screen and (max-width:767px) {
ul.portfolio-hover-items-list h1 {
    margin-top: 5px !important;
    margin-bottom: 5px !important;
}
}

THANK YOU!!!! It works!