add tailwind to rust build script

build.rs

use std::process::Command;

fn main() {
	let tailwind_cmd = "npx tailwindcss -i input.css -o assets/app.css";

	if cfg!(target_os = "windows") {
		Command::new("cmd").arg("/C").arg(tailwind_cmd).status()
	} else {
		Command::new("sh").arg("-c").arg(tailwind_cmd).status()
	}
	.expect("error running tailwind");

	println!("cargo:rerun-if-changed=tailwind.config.js");
	println!("cargo:rerun-if-changed=input.css");
}

excellent!