<style>
    body {
        font-family: Arial, sans-serif;
        margin: 0;
        padding: 0;
        background-color: #f4f4f4;
        text-align: center;
    }

    .container {
        width: 70%;
        margin: 10px auto;
        background: white;
        padding: 20px;
        box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    }
    .col-md-6 .card-body table {
        margin-top: -10px; /* 调整上边距大小 */
        margin-bottom: -20px; /* 调整下边距大小 */
    }
    
    input, button {
        padding: 10px;
        margin: 10px 0;
        border: 1px solid #ddd;
        border-radius: 4px;
        width: 95%;
    }

    button {
        background-color: #4CAF50;
        color: white;
        border: none;
        cursor: pointer;
    }

    button:hover {
        background-color: #45a049;
    }

    h2, h3 {
        color: #333;
    }

    /* Custom Button Style */
    .btn-custom {
        background-color: #4CAF50;
        color: white;
    }

    .btn-custom:hover {
        background-color: #45a049;
    }
</style>
