:root {
    --col-o: #ff481a;
    --col-y: #ffcd1a;
    --col-gr: #4cff1a;
}
o {
    color: var(--col-o);
}
y {
    color: var(--col-y);
}
gr {
    color: var(--col-gr);
}
ex {
    animation-name: expert;
    animation-duration: 100ms;
    animation-delay: 0;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
}
@keyframes expert {
    0% {
        color: #1aabff
    }
    50% {
        color: #1afff4
    }
    100% {
        color: #1aabff
    }
}