Zoom Gallery Images on Hover

Hey there, for some reason the various codes I've tried is only working inside the galleries on the interior pages, but in the section on the homepage, the images will not zoom on hover. They are transparent .pngs, that shouldn't make a difference right?  I tried pointing it to just the block, still nothing. Here's where I ended up. Any help appreciated!

#block-yui_3_17_2_1_1693919141829_62988 .gallery-grid-item img:hover{height:100%!important; width:100%!important; transform:Scale(1.2); overflow:hidden!important;} 

.gallery-grid-item {overflow:hidden!important}

Can you share your website and this page this gallery is on?