body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
}

#app {
    text-align: center;
}

#reader {
    width: 300px;
    margin: 0 auto;
}

#qrcode {
    margin-top: 20px;
}

#installBtn, #resetBtn {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    border-radius: 4px;
}

#resetBtn {
    background-color: #f44336;
}