.fill-text-span {
    -webkit-background-clip: text;
    background-clip: text;
    background-color: transparent;
    background-image: linear-gradient(to right, #000 0%, #000 50%, #9e9e9e 50%, #9e9e9e 100%);
    background-position: 0% 0%;
    background-repeat: no-repeat;
    background-size: 200% 100%;
    color: transparent;
}

.js-fill .fill-text-span {
    background-position: 100% 0%;
}

@media (prefers-reduced-motion: reduce) {
    .fill-text-span {
        background-position: 0% 0%;
    }
}