Help center a Grid Overlay Single Column layout?

Site URL: https://www.bryanbarnes.me/

I built a portfolio collection and wanted to have a single column of content vs a grid with medium sized images. So i added this code below. But having issues making the column centered? Any help would with be appreciated! 

/* 100% (auto) */

[class^="portfolio-grid-"] {
  grid-template-columns: 62%;
  }
 

15 hours ago, bryanb11 said:

Site URL: https://www.bryanbarnes.me/

I built a portfolio collection and wanted to have a single column of content vs a grid with medium sized images. So i added this code below. But having issues making the column centered? Any help would with be appreciated! 

 

/* 100% (auto) */

[class^="portfolio-grid-"] {
  grid-template-columns: 62%;
  }
 

 

 

You seems to get it solved right?