.navbar-default {
    display: flex;
    align-items: end;
    justify-content: space-between;
}

.navbar-brand {
    max-width: 300px !important;
}

@media (max-width: 799px) {

    header {
        background-color: rgba(0,0,0,0.5);
    }
    .navbar-default {
        flex-direction: column;
        align-items: start;
    }

    .navbar-header {
        width: 100%;
    }

    .navbar-collapse {
        width: 100%;
    }

    .menu1-selected, .menu1 {
        width: 100%;
    }
}