body {
            font-family: 'Open Sans';
            margin: 0;
            padding: 2.5%;
            background-color: #f4f4f4;
            font-size: 16px;
            line-height: 1.5;
        }
        h1 {
            color: #333;
            text-align: center;
            margin-top: 20px;
            font-size: 25px;
          line-height: 1.5;
        }
        h2 {
            color: #333;
            text-align: center;
            margin-top: 20px;
            font-size: 18px;
          line-height: 1.5;
          	
        }
        h2 b {
            color: red;
          	font-family: 'Open Sans';
            transition: .3s;
          line-height: 1.5;
        }
        h2 b:hover {
            background-color: yellow;
        }
        h3 {
            color: #333;
            text-align: center;
            margin-top: 20px;
            font-size: 14px;
        }
        ul {
            list-style-type: none;
            padding: 0;
            margin: 20px auto;
            max-width: 600px;
            background-color: #fff;
            border: 1px solid #ccc;
            border-radius: 5px;
        }
        li {
            padding: 10px 20px;
            border-bottom: 1px solid #ccc;
        }
        li:last-child {
            border-bottom: none;
        }
        a {
            color: #007bff;
            text-decoration: none;
            transition: color 0.3s;
            cursor: pointer; /* Thêm dòng này để con trỏ chuột hiển thị dạng bàn tay khi di chuột qua liên kết */
        }
        a:hover {
            color: #0056b3;
        }
        /* Thêm CSS cho hộp thông báo */
        #notification {
            position: fixed;
            bottom: 20px;
            right: 20px;
            padding: 10px 20px;
            background-color: #3f80b9;
            font-size: 14px;
            color: #fff;
            border-radius: 5px;
            opacity: 0;
            transition: opacity 0.5s ease-in-out;
            z-index: 9999;
        }
        @media (max-width: 600px) {
            #notification {
                left: 20px;
            }
        }