.topnav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: #ffffff;
            border-bottom: 1px solid #dbdbdb;
            padding: 10px 20px;
            position: relative;
        }

        .topnav a {
            margin: 0 15px;
            font-size: 16px;
            color: #262626;
            font-weight: bold;
            text-decoration: none;
        }

        .topnav a.active {
            border-bottom: 2px solid #0095f6;
        }

        .menu-icon {
            display: none;
            font-size: 24px;
            cursor: pointer;
        }

        .topnav .menu {
            display: flex;
        }

        .topnav .menu a {
            display: block;
        }

        @media (max-width: 768px) {
            .topnav .menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 50px;
                left: 0;
                width: 100%;
                background-color: #ffffff;
                border-top: 1px solid #dbdbdb;
            }

            .topnav .menu a {
                padding: 10px 20px;
                text-align: center;
            }

            .menu-icon {
                display: block;
            }

            .topnav.active .menu {
                display: flex;
            }
        }