@media (min-width: 768px) {
    .back-to-top-link.show {
        display: block;
    }
}

@media (max-width: 767px) {
    .header-top {
        display: none;
    }
    .navbar-nav {
        flex-direction: column;
        justify-content: space-between;
    }
    .nav-item {
        margin: 0 auto;
    }
}