body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: lightgrey;
}

body.centered {
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

body.centered p {
    margin: 0.5rem 0;
}

body.centered .group {
    margin: 1rem 0;
}

body.centered .group p {
    margin: 0.2rem 0;
}

header {
    background-color: #333;
    color: white;
    padding: 1rem;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin-right: 1rem;
}

nav ul li a {
    text-decoration: none;
}

main {
    display: flex;
}

#posts {
    flex: 1;
    padding: 1rem;
}