How to make gallery slideshow fill the screen on mobile

I am trying to edit the first slideshow on the home page to make it the full height of mobile, so the images crop themselves to fit this portrait view.

It doesn't let me drag the slideshow down to the full height.

website link: mustard-tetra-zr93.squarespace.com

password: whitehouse123

Try adding to Design > Custom CSS

/* resize mobile list slideshow */
@media screen and (max-width:767px) {
.user-items-list-item-container[data-section-id="63c6c1ef8f2ee3486accd0f2"] ul {
    min-height: unset !important;
}
}