table {
            width: 100%;
            border-collapse: collapse;
        }
        th, td {
            padding: 8px;
            text-align: center;
            border: 1px solid #ddd;
        }
        th {
            background-color: #f2f2f2;
            position: sticky;
            top: 0;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        tr:hover {
            background-color: #f1f1f1;
        }
        .add-form {
            margin-top: 20px;
            padding: 15px;
            background-color: #f2f2f2;
            border-radius: 5px;
        }
        .form-group {
            margin-bottom: 10px;
        }
        input, button {
            padding: 8px;
            border: 1px solid #ddd;
            border-radius: 3px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            border: none;
            cursor: pointer;
        }
        button:hover {
            background-color: #45a049;
        }
        .actions {
            display: flex;
            gap: 5px;
            justify-content: center;
        }
        .refresh-button {
            background-color: #2196F3;
        }
        .refresh-button:hover {
            background-color: #0b7dda;
        }
        .delete-button {
            background-color: #f44336;
        }
        .delete-button:hover {
            background-color: #da190b;
        }
        .timer-close {
            color: red;
            font-weight: bold;
        }
        @media screen and (max-width: 768px) {
            table {
                font-size: 14px;
            }
            th, td {
                padding: 5px;
            }
            input, button {
                width: 100%;
                margin-bottom: 5px;
            }
            .form-group {
                display: flex;
                flex-direction: column;
            }
        }