body {
    background: radial-gradient(ellipse at center, #111 20%, #000 100%);
    background-attachment: fixed;
    height: 100%;
    min-height: 100vh;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
}
.four-oh-four {
    font-size: 15vw;
    text-align: center;
    width: 100%;
    position: relative;
    animation: float 5s ease-in-out infinite;
    transform-style: preserve-3d;
}

/* For mobile screens */
@media (max-width: 600px) {
    .four-oh-four {
        font-size: 20vw; /* Adjust the font size as needed */
    }
}