Want to use default GitHub/Jekyll? code formatting and quote formatting

Ok, I fixed the blockquote problem, by adding the following to my “assets/css/main.scss” file under @import "minimal-mistakes"; // main partials:

blockquote {
  /* Override `font-style: italic;` in "_base.scss" */
  font-style: normal;
}

I’d still like to go to default Jekyll code block formatting though, if someone knows how.