custom css to change a font on product detail page sold label

On my product detail page, when a product is sold, a "sold" label appears which is tied to the paragraph 2 font.  I wish to customize this font similarly to how I can customize the sold label on the product list page but it is not available on product detail currently (I worked with support).  Can someone tell me the correct code syntax for changing a font?  I am not a coder so I don't know it and just need to be able to copy the correct code into the custom css area of the page to change the font of the word "sold".  Thank you so much!!!!

I'm in a 7.1 Squarespace site just in case that knowledge is helpful.

Hi, can you please share the url of your site?  If you could share your site url and let me know how you want to change the font, I might be able to give you a customized solution for your website.

Here's a solution I applied to one website recently: 

.product-mark.sold-out {
    font-size: 1.3rem !important;
    font-weight: 600 !important;
}