Adjusting size of gallery section on mobile

Site URL: http://www.dronefreq.com

Hello, I'm trying to decrease the negative space that my gallery section is taking up on my homepage. Is there a code that will minimize the height of this element on mobile only? I would like to decrease the space in between "Real Estate Photography" and the image toward the bottom of the screen in the attached image.

Thank you

www.dronefreq.com

Add to Design > Custom CSS

@media screen and (max-width:767px) {
.gallery-slideshow {
    height: 35vh !important;
}
}