Change product previous price color

Am trying to change the color of the products original price (the one in grey when a product is on sale) using the css below. On dekstop, everything is the way i want it but when i check on my mobile device(real device), the strikethrough line is still grey.

Below is the CSS am using

/*Product original price*/
del .amount {
    color: #E30425;
    text-decoration: #E30425 line-through !important;
}