body {
    font-family: Arial, sans-serif;
    background-color: #111;
    color: #fff;
    margin: 0;
    padding: 0;
    text-align: center;
}

h1 {
    margin-top: 20px;
    font-size: 24px;
}

#reader {
    margin-top: 20px;
    border: 4px solid #fff;
    border-radius: 10px;
}

#status-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2em;
    font-weight: bold;
    z-index: 9999;
}

.hidden {
    display: none;
}

#status-screen.green {
    background-color: #28a745;
}

#status-screen.red {
    background-color: #dc3545;
}