.catalog-element-offers-property-value.sku-not-available {
    opacity: 0.35;
}

.catalog-element-offers-property-value.sku-not-available[data-state="selected"] {
    opacity: 0.35;
}

.catalog-element-offers-property-value.sku-not-available [data-role="property.value.content"] {
    filter: grayscale(1);
}