body        {
            background-color: whitesmoke;
            text-align: center;
}
            
h1          {
            margin: 0;
            font-family: "monospace";
            font-size: 25px;
}
            
#barcode    {
            margin-top: 10px;
            padding-top: 5px;
            padding-bottom: 5px;
            border: 1px dotted grey;
            background-color: white;
            letter-spacing: 3px;
}

button      {
            display: inline;
            margin-top: 10px;
}