CSS for Squarespace Shopping

I am having some trouble finding css code to change the colors of the below. 

-Continue Shopping Button 

-Add to Cart Button

I was able to find code for the checkout button but not for the above. Can anyone help with this? 

Just adding on here.

I see that my new black buttons for "continue shopping" and "add to cart" flashes from the old color grey to the new color black when I reload the page. 

How do I fix this? 

Hi,

Can you share link to a product? We can check easier

Hi,

I can't provide a link since the website is not live yet.

I have attached an image below of the button I am needing css code for. I was able to find code for the button through my web inspector but it did not work. 

Thank you