header {
    min-height: 7vh;
}

    header .navbar-brand div {
        width: 100px;
    }

    header .navbar-brand img {
        max-height: calc(7vh - 1rem);
    }

@media (min-width: 768px) {
    header .navbar-brand div {
        width: 250px;
    }

    header .dropdown-menu .dropdown-header {
        
    }
}