.rainbow-text {
    background: linear-gradient(90deg,
            red,
            orange,
            yellow,
            green,
            cyan,
            blue,
            violet,
            red);
    background-size: 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: rainbowMove 10s linear infinite;
}

@keyframes rainbowMove {
    0% {
        background-position: 0%;
    }

    100% {
        background-position: 400%;
    }
}