Almost! had to change it to this

.penci-grid_7 .penci-block_content__items{
    margin-left: -10px;
    margin-right: -10px;
}
.penci-grid_7 .penci-post-item{
    border-left-width: 10px;
    border-right-width: 10px;
}

And since I'm here, I have another question:
In the same page, if I scroll to the end with the mouse wheel there's a little glitch just before the footer. It seems there's an empty area after the 2-column content. I could live with it but I was wondering if there is an easy fix. Cheers!

Hello there,

First of all I am loving you theme, really! :)

I was trying to give a bit more padding to the image blocks in Penci Big Grid 7 but my css is messing up the other alignments. 

The block is the first one with the 3 big images www.tortaoragione.it

This is the code that I was using but was messing up the rest:

.penci-post-item:nth-child(1){
    padding-right:10px;
}
.penci-post-item:nth-child(2){
    padding-left:5px;
    padding-right:5px;
}
.penci-post-item:nth-child(3){
    padding-left:10px;
}

Is there a way to keep the whole block aligned left and right and give more space in between the images?

Thank you!

Marco