.textShadow {
    color: coral;
    font-size: 6em;
    font-family: Roboto, sans-serif;
    text-align: center;
    text-shadow: 
    0.025em 0.025em 0 yellow,
    0.050em 0.050em 0 blue,
    0.075em 0.075em 0 red,
    0.1em 0.1em 0 green;
    animation-name: changeColor;
    animation-duration: 140ms;
    animation-iteration-count: infinite;
}

@keyframes changeColor {
    0% {
        filter: hue-rotate(0deg);
    }
    100% {
        filter: hue-rotate(3600deg);
    }
}