body {
    margin: 0;
    padding: 0;
    height: 100vh;
    width: 100vw;
    background: linear-gradient(45deg, #0a0010, #1a0d2e, #2d1b4e, #0a0010);
    background-size: 400% 400%;
    animation: colorShift 15s ease-in-out infinite;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow: hidden;
    display: flex;
    flex-direction: row;
}

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