html, body {
   
}

body {
    margin: 0;

    background: linear-gradient(-0deg, #021B79 30%, #0575E6 60%, #1FA2FF 70%, #d5f2f5 90%); background-attachment: fixed;
    background-size: 100% 150%;
    animation: gradient 8s ease infinite;
}

@keyframes gradient {
    0% {
        background-position: 50 0%;
    }
    50% {
        background-position: 50% 40%;
    }
    100% {
        background-position: 50 0%;
    }
}