Custom Grid Layout

Site URL: https://www.hannahmaiselphotography.com

Hi all, 

I've been desperately trying to find the correct code to make a custom grid layout on the above site. I need it to also click though to a gallery page. I tried imputing the following code, but it's wasn't working. I tried creating an images page instead, but there's not a way to attach a click through URL?

#Main-content {
  .sqs-gallery {
    display: grid:
  }
  margin-wrapper:nth-of-type (1) {
    grid-area: S1;
  }
}

I'm very new to coding so it's possible none of this makes sense. Please help! Trying to do something like the attached screenshot. 

Hi. Can you share link to page where you use grid? We can test code easier