#messageButton {
            position: fixed;
            bottom: 130px;
            right: 13px;
            padding: 10px 16px;
            background-color: #007BFF;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }
        #messageCount {
            position: absolute;
            top: 490px;
            right: 11px;
            background-color: red;
            color: white;
            font-size: 12px;
            padding: 2px 7px;
            border-radius: 50%;
        }
        #messageBox {
            display: none;
            position: fixed;
            bottom: 180px;
            right: 20px;
            width: 320px;
            height: 430px;
            background-color: white;
            border: 1px solid #ccc;
            border-radius: 5px;
            box-shadow: 1px 3px 10px rgba(0, 0, 0, 0.3);
            overflow-y: auto;
        }
        .message-item {
            padding: 10px;
            border-bottom: 1px solid #eee;
        }
        .message-time {
            font-size: 12px;
            color: #999;
            margin-bottom: 5px;
        }
        .message-content {
            margin-bottom: 5px;
        }
        .message-file {
            max-width: 100%;
        }