How can I adapt code to apply to all collections on my website?

Store Design
, ,
1 
<style>
@media screen and (min-width: 750px){
  .section-template--20213893038425__main-collection-product-grid-padding.gradient .page-width {
     max-width: 100%!important;
     margin: 0 20px !important;
   }
}

</style>

In an another post a guys gave me this code that is working as intended, but i would like to extend this to all my collection.

How to change the code to work this way?

thanks in advance

www.danicoffeeshop.com