.hero-bg, .hero-bg.parallax .parallax-bg {
    background-image: url("https://www.paypalobjects.com/webstatic/mktg/wright/invoice_system/Invoicing_hero_hands.jpg");
}

.n4, .n4.parallax .parallax-bg {
    background-image: url("https://www.paypalobjects.com/webstatic/mktg/wright/invoice_system/Invoicing_stamp.jpg");
}