This members-only tutorial provides the steps to add particles.js as a background for a homepage Section for viewports that are at least 481px wide in Oxygen using matchMedia (thanks SupaMike).

Live Demo

Step 1

Let us load particles.js library on the homepage.

Install and activate My Custom Functionality plugin.

Connect to your hosting account using a FTP client and navigate to site's /wp-content/plugins/my-custom-functionality-master directory.

Upload particles.min.css to plugin's assets/css directory.

Edit plugin.php and replace

add_action( 'wp_enqueue_scripts', 'custom_enqueue_files' );
/**
 * Loads <list assets here>.
 */
function custom_enqueue_files() {
	// if this is not the front page, abort.
	// if ( ! is_front_page() ) {
	// 	return;
	// }
	// loads a CSS file in the head.
	// wp_enqueue_style( 'highlightjs-css', plugin_dir_url( __FILE__ ) . 'assets/css/style.css' );
	/**
	 * loads JS files in the footer.
	 */
	// wp_enqueue_script( 'highlightjs', plugin_dir_url( __FILE__ ) . 'assets/js/highlight.pack.js', '', '9.9.0', true );
	// wp_enqueue_script( 'highlightjs-init', plugin_dir_url( __FILE__ ) . 'assets/js/highlight-init.js', '', '1.0.0', true );
}

with