Using code to correct for Portfolio pages having the same layout throughout a site

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

Hi -- I'm trying to give my different portfolio pages different layouts -- ideally three across for the page containing three projects and two across for the one containing two projects. Unfortunately whatever layout I set for portfolio pages carries through the whole site and can't be individualized, so I need some sort of design code to edit their appearance. Can anyone help here?

Thanks! 

Hello,

How strange, I'm not sure if this is a new issue or has always been the case when using the same "grid:simple" or template grids on the website for different portfolio pages. I would bring it to the attention of a support representative if you feel so compelled.

To make matters more strange, Squarespace's grid system is finicky and will reject standard grid CSS. Here's the code I use, just target the section that you want to have 2 columns. Be careful setting any other dimensions like spacing after inserting the code or remember to disable it when editing and adjust accordingly.  

[data-section-id="YOUR_SECTION_ID_HERE_"] {
  @media only screen and (min-width:640px){
.portfolio-grid-basic{
  display: grid !important;
grid-template-columns: repeat(2,minmax(~"250px, 1fr")) !important;
	}
  }
}

Thanks a ton for the reply. I'll give this a shot. I raised it with my support rep, who said she'd be flagging it up the chain. So, hopefully it's remedied soon. Thanks again.