* {
    margin: 0;
    padding: 0;
}
body{
    background-color: black;
}
.command {
    margin: 10px auto;
    font: normal 100% "Comfortaa", sans-serif;
    color: darkred;
}
.box {
    text-align: center;
    margin: 10px auto;
    font: normal 100% "Comfortaa", sans-serif;
    cursor: pointer;
    animation: gradient 10ms ease infinite;
}
@keyframes gradient {
    0% {
        color: blue;
    }
    50% {
        color: blueviolet;
    }
    75%{
        color: darkblue;
    }
    85%{
        color: blue;
    }
    100% {
        color: blueviolet;
    }
}