margin thubnails

Hello again
I use Olsen light theme
I manage to change the width of the Olsen light theme with css code
I manage the sidebar also change the position to the right
But i have a problem
I use the SUPER gallery that you made
and i want to fill my thubnails the gap
As you see in the link here
http://stilvijewellery.com/catalog/katalogos-test/

I want to change the margin or the padding from the thumbnails and make the thubnails move to the center of the container
Alternative is to fill the gap and make the thubnails fill the container width
Here is the CSS
I use custom Css plugin for this page

@media (min-width: 1200px) {
  .container {
   width: 1400px;
  }

.sidebar {
margin-left: 10%;
margin-right: 10%;
float: right;
	width: 310px !important;
}

https://wordpress.org/plugins/gallery-by-supsystic/