body.catalog-category-view .products .product-info span.price {
    position: relative;
}

.c-price:not(.loaded) {
    visibility: hidden;
}

.option-tab.option-not-valid {
    position: relative;
}

.option-tab.option-not-valid::after {
    content: "";
    position: absolute;
    top: -2px;
    right: -2px;
    width: 0;
    height: 0;

    border-top: 15px solid red;
    border-left: 15px solid transparent;
}


/*body.catalog-category-view .products .product-info span.price:not(.loaded):after,
body.catalog-product-view .price-container span.price:not(.loaded):after
{
    content: "";
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: white;
    position: absolute;
}*/