Due to a kitchen renovation, a small part of the pantry floor doesn't have tiles, just bare concrete. It measures 500 x 1100mm and is not an area you could step on unless you removed all the shelves. I have some wall tiles I can use (blue station tiles visible in the photo), but due to some kind of underlay under the other tiles, there would be a height difference.
What would be the best way to fill this in?
