@keyframes GradientScroll {
    from {
        background-position: 100% 100%;
    }
    to {
        background-position: 0% 0%;
    }
}

h1 {
    font-size: 10vw;
}

span {
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    font-size: 10vw;
    background-image: linear-gradient(90deg, rgba(255, 0, 0, 1), rgba(0, 255, 0, 1), rgba(0, 0, 255, 1));
    background-size: 800% 800%;
    /*background-attachment: fixed;*/
    animation: GradientScroll 2s linear infinite alternate;
}

body {
    background-color: #222;
}