How to make Gallery width Bigger on Mobile?

Site URL: https://reindeer-flamingo-wzp3.squarespace.com/

@tuanphan How do i make the gallery block bigger on the right and left. I want the whole image set larger! on MOBILE. 

Password: 12

Try adding to Design > Custom CSS

@media screen and (max-width:767px) {
.gallery-slideshow img {
    transform: scale(1.3);
}
.gallery-slideshow-item{
    overflow: visible !important;
}
.gallery-slideshow-item-src {
    overflow: visible !important;
}
html, body{
    overflow-x:hidden;
}
}

This works well. 

But now I have this new issue. How do i add space at the top and the bottom?

Just tested the code & no problem here. Can you keep the code in Custom CSS? We can check it again easier