Hi Ernest,
Thank you very much! Quite embarrassing that an extra comma had caused that problem. I can’t imagine how I could have done that!
The CSS on the main site has certainly done the trick, though I have changed the code to 50% instead of 100% on mobile as the images were coming out blurry (I was very proud for having worked that out).
Unfortunately, there is one more complication, which is that on product pages, I am still using the slick and slide format. Now those images look v strange on mobile. See example here
https://southeastasiabackpacker.com/bookings/liveaboard-komodo/
Is there anything I can add to the code so that it only applies on the isotopic instance?
Thanks for your help!