@media (min-width: 992px) {
    .navbar-mainnavigation.navbar-transition {
        margin-bottom: 30px; /* 100px - 70px */
    }
}

@media (min-width: 1200px) {
    .navbar-mainnavigation.navbar-transition {
        margin-bottom: 40px; /* 110px - 70px */
    }
}