body{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;margin:0}pre{max-width:100vw;overflow:hidden;font-size:clamp(.3rem,1.3vw,1rem);padding:0 1rem;background:linear-gradient(90deg,#222,#999,#ddd,#999,#222,#999,#ddd,#222);background-size:200% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:rainbow-wave 3s linear infinite}@keyframes rainbow-wave{0%{background-position:0% 50%}to{background-position:200% 50%}}