body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;

    background: linear-gradient(270deg, #ff002f, #e121e1, #4040e8, #19a9b4, #19a9b3);
    background-size: 600% 600%;
    animation: gradient 15s ease infinite;
}

iframe {
    width: 90vw;
    min-height: 90vh;
    border: none;
    margin: 0;
    padding: 0;
}

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