CSS for archives

I’d like to change the style of my archive page ( https://www.elainevigneault.com/archives/ ) but I don’t know where to begin. Are there archive templates/ free CSS for WP archives available anywhere? I’d love to slap on a style instead of create one from sratch myself.

I am using Extended Live Archives so I assume style sheets made for either ELA or Super Archives would work. Or else, just suggestions? I’m at a loss.