betsymintontech

How can I make my porfolio page showcase images like in the attach. I was trying to customized it with the next code, but I am obviously missing something.  Can someone help, please?
I search the internet in my quest for an answer, but there was nothing. Help please!
 
#gridThumbs {
  .gallery-grid-wrapper {
    grid-template-columns:
    none ! important;
    display:grid;
    grid-template-areas:
    "small1 small2"
    "big1 big1"
    "big1 big1" "small3 big2"
    "small4 big2"    "big3 big3 " "big3 big3 ";
  }  
 
  a:nth-of-type(1) {
  grid-area:small1;  
  }
  a:nth-of-type(2) {
  grid-area:small2;  
  }
  a:nth-of-type(3) {
  grid-area:big1;  
  }
  a:nth-of-type(4) {
  grid-area:small3;  
  }
 a:nth-of-type(5) {
  grid-area:big2;  
  }
 a:nth-of-type(6) {
  grid-area:small4;  
  }
 
  a:nth-of-type(7) {
  grid-area:big3;  
  }
 
  }