Change Minimalist theme default colors

Hello, I would like to change the purple and lilac colors of the titles in the Minimalist theme. I tried to change the style.css file in the theme folder, with the colors of my preference, but nothing changed on the site.

Please, would someone tell me how I should proceed to get it? Or which file should I change?

thanks

What file did you change? Changing the CSS should be all that’s required to make that kind of change.

Maybe you just need to clean your browser cache?