[NSFW] Changing link colour(s) on a theme

My site: https://brasandbodyimage.com/ (bra pics, potentially NSFW depending on workplace).

Hi all. I’m currently using the Able theme, and I’d like to change some of the link colours if possible, but I haven’t been able to find the best way to do it. So far I’ve messed around a bit and used a child CSS sheet to change the navigation bar at the top to be black when not selected (from light grey), and the text to be grey (from black), which also changed the older posts link colour to be grey.

Pretty much all of the other hyperlinks are navy blue, and the post titles are navy blue on hovering. I would like to change all of the navy blue links to a dark pink (something like #df144d). What would be the best way of doing this? Thanks in advance.