html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1; /* fills remaining vertical space */
    display: flex;
    justify-content: center;
    align-items: center;
}

#status {
    display: block;
    padding: 8px 10px 8px 10px;
    margin: 20px auto 0 auto;
}