.particle-background{position:fixed;top:0;left:0;width:100vw;height:100vh;background:radial-gradient(ellipse 80% 80% at 50% 120%,rgba(150,0,0,.5),transparent);background-color:#000;overflow:hidden;z-index:-1}.particle{position:absolute;bottom:0;left:var(--x);width:var(--size);height:var(--size);background-color:#ff5252b3;border-radius:50%;box-shadow:0 0 5px #ff5252cc,0 0 10px #ff525280;animation:rise var(--duration) linear var(--delay) infinite;will-change:transform,opacity}@keyframes rise{to{transform:translateY(-100vh);opacity:0}}