n-back.css

body {
    text-align: center;
}

.letter-space {
    font-size: xx-large;
    color: blue;
}

#container {
    display: flex;
    justify-content: center;
}

#state-space {
    min-width: 900px;
    max-width: 1600px;
    display: flex;
    justify-content: space-between;
    border: 1px solid black;
}

.state-item {
    display: inline;
}