Unavailable variations won’t blur on my product page.

Hello, i contact you because i have a product that has a lot of variations (with colors and sizes) and some sizes are not available for all the colors.

Here is the link of the product i’m talking about : https://papier-transfert.fr/produit/flex-paillete

So whenever a customer choose a color (for example the first one “doré pailleté”) i would like the unavailable size just below to blur so that the customer can only choose the available sizes.

As you can see on the screenshot, when i choose a color with an unavailable size, a message of unavailability appears (which is not usr friendly)

However, on the variations plug in i put “blur with cross” in “disabled atttribute style” but it does not work.

Could you please help me with this issue. Best Regards

Tim Delage