html, body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    height: 100%;
    background-color: #111827;
}

#app {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}