body {
    background: #000;
    margin:0;
    padding: 0;
    background-image: url("moon.png");
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center; 
    opacity: 0;
    animation: fadeIn 3s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.wrapper {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    display: flex;
    height: 100vh;
    width: 100vw;
  }