Can anyone help me with coding??

I just spend like 4 hours editing my tag page. Set up a new html code thing and got my very extensive tag lists up there lol. But I think it looks good! Much better than my old one, but for the life of me I cannot figure out how to change the colors on it. Idk if it’s possible or not, but it doesn’t realllyyy match the rest of my theme and I’d like it to if possible. Please help me!!😬