.bg-hero{background-image:url(/path/to/your/background-image.jpg)}.scroll-up-animation{animation:scroll-up 1s infinite alternate}@keyframes scroll-up{0%{transform:translateY(0)}to{transform:translateY(-20%)}}.fade-in{animation:fade-in 1s ease-in-out}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.slide-in{animation:slide-in 1s ease-in-out}@keyframes slide-in{0%{transform:translateX(-100%)}to{transform:translateX(0)}}