Need Help adjusting mysterious floating FOOTER in Mobile / custom css

Site URL: https://www.anthonykurtz.com/

Hi there

My site: anthonykurtz.com

example of floating Footer (near middle of photos)

https://www.anthonykurtz.com/single-images

I've used quite a bit of custom css on this site but can't figure out how to get the footer to align at the bottom. Should be simple but I'm lost. 
Thanks in advance @tuanphan <3

23 hours ago, twansky said:

Site URL: https://www.anthonykurtz.com/

Hi there

My site: anthonykurtz.com

example of floating Footer (near middle of photos)

https://www.anthonykurtz.com/single-images

I've used quite a bit of custom css on this site but can't figure out how to get the footer to align at the bottom. Should be simple but I'm lost. 
Thanks in advance @tuanphan❤️

Try adding to Home > Design > Custom Css

@media only screen and (max-width: 767px) {
  section[data-section-id="620b84c18ce4f04c3303f709"] .gallery-masonry-wrapper {
    height: unset !important;
  }
}

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