How can I add more than one Code in the CSS area?

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

How do I add multiple codes to the CSS area? 

I want to make my mobile site have two colums so I use this code and it works great:

@media screen and (max-width:767px) {
.products .list-grid {
    grid-template-columns: repeat(2,minmax(0,1fr)) !important;
    display: grid;
    grid-column-gap: 10px;
    grid-row-gap: 20px;
}
}

But then I also want all my sold out products to be moved down and the available products to be at the top of the shop. So I use this code. Both codes work great alone but not together. 

}
}
.products .grid-item { width: 48%;
}
}.products.collection-content-wrapper .products-flex-container .list-grid .grid-item.sold-out {
  order: 2
}

.products.collection-content-wrapper .products-flex-container .list-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
}

@media only screen and (max-width: 768px) {
  .products.collection-content-wrapper .products-flex-container .list-grid {
    grid-template-columns: 1fr;
  }
  .products.collection-content-wrapper .products-flex-container .list-grid .grid-item {
    width: 100%;
  }
}

.products.collection-content-wrapper .products-flex-container .list-grid .grid-item {
  width: 80%;
}
}

Any help would be really appreciated.

thank you

Brittany

You have syntax errors in your code. Most rule-sets only have a single open/close curly bracket.

@media queries are a bit different in that you enclose rule-sets within it.

Here is some cleaned-up code but I haven't tested it.

@media screen and ( max-width : 767px ) {

  .products .list-grid {
  
    grid-template-columns: repeat(2,minmax(0,1fr)) !important;
    display: grid;
    grid-column-gap: 10px;
    grid-row-gap: 20px;
    
    }
    
  }

.products .grid-item { 
  
  width: 48%;
  
  }

.products.collection-content-wrapper .products-flex-container .list-grid .grid-item.sold-out {

  order: 2;
  
  }

.products.collection-content-wrapper .products-flex-container .list-grid {

  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  
  }

@media only screen and (max-width: 768px) {

  .products.collection-content-wrapper .products-flex-container .list-grid {
    
    grid-template-columns: 1fr;
    
    }
    
  .products.collection-content-wrapper .products-flex-container .list-grid .grid-item {
  
    width: 100%;
    
    }
    
  }

.products.collection-content-wrapper .products-flex-container .list-grid .grid-item {

  width: 80%;
  
  }

Let us know how it goes.