.n3 {
    background-image: url("https://www.paypalobjects.com/webstatic/en_HK/mktg/featureimage/how-PayPal-works-hk_n1_1.jpg");
}
.hero-bg, .hero-bg.parallax .parallax-bg {
    background-image: url("https://www.paypalobjects.com/digitalassets/c/website/marketing/apac/hk/optimized/assets/how-PayPal-works_hero_bg_1x.jpg");
}
.n4, .n4.parallax .parallax-bg {
    background-image: url("https://www.paypalobjects.com/digitalassets/c/website/marketing/apac/hk/optimized/assets/how-PayPal-works_n2_1x.jpg");
}