div.navbar_parent {
    display: flex;
    flex-flow: column;
    align-items: center;
}

ul.navbar {
    margin-top: 0;
    margin-bottom: 0;
    padding: 0;
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: space-around;
    max-width: 100%;
}

ul.navbar li {
    display: inline;
    text-align: center;
    height: 1rem;
    line-height: 1rem;
}

ul.navbar li.nav_button {
    flex-shrink: 1;
    margin: 0.3rem;
}

ul.navbar li span {
    display: inline-block;
}

ul.navbar li a {
    display: inline-block;
    white-space: nowrap;
    width: 100%;
}