Hi

I'd like to create a portfolio page in packery higlights style like your demo.
I flag higlights in some portfolio pages, and I created a new portfolio selecting 3x columns and masonry grid or justified grid . 

It works only if I a put Gaps Size = 0; but I'd like to add gap 18px or more.

Please can you help me??

I solved half part of the problem. The pictures have the right dimensions. 

But I can't create a square type highlight. I tryed with you demo pic but it doens't generate a 

This is your code
<div class="image-inner"></div>
  <picture> 
   <img src=".../2016/02/Rubber-Stamp-MockUp-2-thegem-portfolio-double-4x-hover-gap-18.jpg" width="634" height="575" class="attachment-thegem-portfolio-double-4x-hover-gap-18" alt="New UI Kit"> 
  </picture>
</div>
This is mine  
<div class="image-inner"> 
   <img src=".../2017/04/Rubber-Stamp-MockUp-2-thegem-portfolio-justified.jpg" width="844" height="767" alt=""> 
</div>