Code blocks without syntax highlighting:

────────────────────
Some plain
code block
   fooo
────────────────────

Or with syntax highlighting, eg, Rust:

────────────────────
fn main() {
    println!("Hello world")
}
────────────────────

Or Scala:

────────────────────
object HelloWorld {
  def main(args: Array[String]): Unit = {
    println("Hello, world!")
  }
}
────────────────────