Zoom Hover Effect for Gallery Images with Links

Can someone help figure out why the code I am using is not working?

I'm following this tutorial and using the sample code provided, but for some reason the changes are not effecting my gallery and I'm guessing this is due to them being linked.

Here's the tutorial: 

Here is my CSS:

.gallery-grid-image img:hover{transform:Scale(1.2);width:100%;height:100%;Overflow:hidden!important; transition-duration:2s}
.gallery-grid-image image:{overflow:hidden!important;} 

Can you share link to gallery where you used the code? We can check easier