Image Swap Help

Site URL: https://kerriedefelice.squarespace.com/

Hello-

So I am working on my Portfolio site and I have used an image swap CSS code. When I am editing my site in the back end, it displays perfectly. When I go to the live site, the first images do not have padding between them and when I rollover the image it has some padding. I have not messed with any padding code, so why is this happening?

Thanks in advance!

Surprisingly for me, I figured it out by swapping to a different code. Below was my solution. 

<a href="YOUR HYPERLINK ADDRESS HERE">
 <img src="YOUR FIRST URL HERE"
onmouseover="this.src='YOUR SECOND URL HERE'"
onmouseout="this.src='YOUR FIRST URL HERE'"></a>