.nav-link {
            position: relative;
        }
        .nav-link:after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -2px;
            left: 0;
            background-color: #3B82F6;
            transition: width 0.3s ease;
        }
        .nav-link:hover:after {
            width: 100%;
        }
        .mobile-menu {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }
        .mobile-menu.open {
            max-height: 500px;
        }
        div#topnav {
            padding-left: 67px;
            background-image: url(/images/logo.png);
            background-size: 39px;
            background-repeat: no-repeat;
            background-position: 18px center;
        }