body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            padding: 0;
        }

        h1 {
            text-align: center;
            color: #333;
            padding: 10px 0;
            margin: 0;
        }

        h2 {
            margin-top: 20px;
            color: #333;
        }

        table {
            width: 80%;
            margin: 20px auto;
            border-collapse: collapse;
            background-color: white;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        table th, table td {
            padding: 10px;
            text-align: left;
            border: 1px solid #ddd;
        }

        table th {
            color: white;
        }

        table tr:nth-child(even) {
            background-color: #f2f2f2;
        }

        table a {
            color: white;
            text-decoration: none;
            margin-right: 10px;
            padding: 5px;
            border-radius: 4px;
        }

        table a:hover {
            text-decoration: underline;
        }

        /* Nút sửa và xóa */
        .edit-btn {
            background-color: #4CAF50;
        }

        .delete-btn {
            background-color: #f44336;
        }

        /* Chỉnh khoảng cách giữa 2 nút */
        table td a {
            margin-right: 5px;
        }

        /* Form thêm hoặc sửa */
        form {
            width: 80%;
            margin: 20px auto;
            background-color: white;
            padding: 20px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        form label {
            font-weight: bold;
            display: block;
            margin-bottom: 5px;
        }

        form input[type="text"], form input[type="url"] {
            width: 100%;
            padding: 10px;
            margin-bottom: 20px;
            border: 1px solid #ddd;
            border-radius: 4px;
            box-sizing: border-box;
        }

        form button {
            background-color: #4CAF50;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }

        form button:hover {
            background-color: #45a049;
        }