Custom MediaLayer skin for WordPress

function mejskin_enqueue_styles() {
    $library = apply_filters( 'wp_audio_shortcode_library', 'mediaelement' );
    if ( 'mediaelement' === $library && did_action( 'init' ) ) {
        wp_enqueue_style( 'mejskin', plugin_dir_url(__FILE__) . 'skin/mediaelementplayer.css', false, null );
    }
}
add_action('wp_footer', 'mejskin_enqueue_styles', 11 );