One column grid on Portfolio page

Site URL: https://www.cindyho.design/

Hi, Square Space doesn't allow us to switch templates but I'd like my portfolio page to display my projects in one column rather than currently three. I can change this on the Design section but can only go down to minimum of 2 column layout. I tried pasting this code based on another user's question, but it didn't work:

div#gridThumbs {
    grid-template-columns: repeat(1,minmax(0,1fr)) !important;
    padding-left: 10vw;
    padding-right: 10vw;
}

Site URL: cindyho.design

Password: 123

Hi,

I see you solved with this CSS?

div#gridThumbs {
    grid-template-columns: repeat(1,minmax(0,1fr)) !important;
    padding-left: 20vw;
    padding-right: 20vw;
}

Hi @tuanphan 

Yes! This is a code that you provided on a different thread. I'd copied it in but it didn't seem to work at first, and then was intermittently working (sometimes would revert back to 2 boxes per column), but now it is consistently working.. weird!

Thank you so very much. Your replies in previous threads have been tremendously helpful.