body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f4f9;
}

.container {
    text-align: center;
}

canvas {
    border: 2px solid #333;
    background-color: #000; /* 背景为黑色 */
}

.buttons {
    margin: 20px 0;
}

button {
    padding: 10px 20px;
    margin: 5px;
    font-size: 16px;
    cursor: pointer;
}

#preview {
    margin-top: 20px;
}

#preview-canvas {
    border: 1px solid #333;
    background-color: #000; /* 背景为黑色 */
}