portfolio Portfolio grid Overlay add vertical spacing

Site URL: http://www.flocdesign.com/works

HI, I want to use the portfolio page with the grid Overlay layout. I can modify the horizontal spacing, but I want to add a vertical spacing too. Can someone help with a css?

Thank you

Scroll down in the dialog and change the vertical spacing.

Let us know how it goes.

Thank you! I changed browser and now I'm able to see the scroll down and access to all the parameters! 

I'm having some trouble with this topic, just slightly different. I've created a portfolio page with about 40 items on it, but the Vertical Spacing control is malfunctioning. When I set it to 1px, it separates the rows by far more. Check it out in the screenshot. I'm not using any custom code on this page, but I am using this in the Design > Custom CSS injection field: 

div#gridThumbs {
    max-width: 900px;
}

But when I remove that code, there's no change. 

Any ideas? Thanks!

I managed to answer my own question but it wasn't very intuitive, so I'm sharing the solution here in case anyone else ever runs into it. 

If your grid spacing is messed up and the slider controls aren't helping, highlight the parameters next to the slider and then manually punch in the pixel count for your vertical and horizontal spacing and it'll force the proper formatting. Not sure if this is a glitch or if I messed up somewhere, but this worked.