Code No Longer Working - Hiding Sold Out items

Dear All

I use the following code to hide sold out items and this has suddenly stopped working on my site www.halexhorns.com

div.sold-out {
    display: none;
}

I assume SquareSpace have applied an update that has stop this from working correctly. Any help with suggestions to rectifying and get it working again would be much appreciated. Thanks J

That's works, at the sold out products has been hidden

That works, thank you very much for your help. J