body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f4f4f4;
}

.container {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    margin-bottom: 20px;
}

canvas {
    border: 2px dashed #ccc;
    cursor: crosshair;
    margin-bottom: 20px;
}

#feedback {
    font-weight: bold;
    margin-bottom: 15px;
}

#nextButton {
    padding: 10px 20px;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

#nextButton:disabled {
    background-color: #ccc;
    cursor: default;
}