For NFC (cipx.xyz/nfcpage)

.rainbow-text-loop{font-size:40px;margin-top:1rem;text-shadow:2px 2px 4px #000;-webkit-animation:5s infinite rainbow}@-webkit-keyframes rainbow{0%,100%{color:orange}10%{color:purple}20%{color:red}30%{color:#5f9ea0}40%{color:#ff0}50%{color:coral}60%{color:green}70%{color:#0ff}80%{color:#ff1493}90%{color:#1e90ff}}