Changing SOLD OUT font color in my Shop All Page

On 7/15/2021 at 8:14 PM, PMKS said:

Site URL: https://www.petitmille-studio.com.au/shop

Hi, I can't find how to change the font colour of the SOLD OUT tag underneath the price of my products. It's currently some light colour that can barely be seen. From my main page it shows a SOLD OUT badge which is great. But upon clicking SHOP ALL page it turns into the text that I want the colour updated please. 

Add to Design > Custom CSS

/* Sold out */
.product-mark.sold-out {
    color: red;
    font-weight: bold;
}