* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    height: 100vh;
    font-size: 16px;
    font-family: Poppins, sans-serif;
    overflow: hidden !important;
    background: #0f0f0f;
    display: flex;
    justify-content: center;
    align-items: center;
}

.background {
    width: 100%;
    height: 100%;
    position: absolute;
}

.moon {
    z-index: 2;
}

.Cloud {
    position: absolute;
    user-select: none;
    filter: brightness(30%);
}

.Star {
    position: absolute;
    user-select: none;
    z-index: -1;
}

.T404 {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 10em;
    color: #fafafa;
    text-shadow: #fafafa 0 0 10px;
    user-select: none;
}

h1 {
    z-index: 1;
    -webkit-animation: fly 5s linear infinite;
    -o-animation: fly 5s linear infinite;
    animation: fly 5s linear infinite;
}

.X {
    margin: 0 2rem;
}

h1:nth-child(2) {
    animation-duration: 7s;
}

h1:nth-child(3) {
    animation-duration: 9s;
}

@keyframes fly {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(60px);
    }
}

@media (min-width: 1024px) {
    .T404 {
        font-size: 20vw;
    }
}

@media (max-width: 768px) {
    .T404 {
        font-size: 7em;
    }
}

@media (max-width: 412px) {
    .T404 {
        font-size: 6.5em;
    }
}

@media (max-width: 300px) {
    .T404 {
        font-size: 4.5em;
    }
}