Targeting last-child in Gallery

Site URL: https://cone-tuna-x47f.squarespace.com/

I am trying to target the last image in this gallery to hide on mobile only to avoid the empty white space.

Thanks in advance for the help!

https://cone-tuna-x47f.squarespace.com/

pw: haircare

Use this CSS

@media screen and (max-width:767px) {
[data-section-id="61297e8589e75c71b3b55287"] figure:nth-child(n+5) {
    display: none;
}
}

@tuanphan thank you so much!