@keyframes rainbow {
    from {
        filter: hue-rotate(0deg)
    }

    to {
        filter: hue-rotate(360deg)
    }
}

html {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    color: cyan;
    background-color: gray;
}

h1 {
    animation: 2s linear infinite rainbow
}

img {
    height: 50vw;
    display: flex;
    justify-self: center;
}