#particles{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.particle{position:fixed;border-radius:50%;animation:floatUp linear infinite;pointer-events:none;z-index:0}
@keyframes floatUp{0%{transform:translateY(110vh) rotate(0deg);opacity:0}10%{opacity:1}90%{opacity:1}100%{transform:translateY(-10vh) rotate(720deg);opacity:0}}