that seems like a cute thing to do...

.one-navbar__logo-container {
    background: url(https://www.fotolip.com/wp-content/uploads/2016/05/Trans-flag-1.png) repeat-x;
    background-size: contain;
    display: flex;
    flex-direction: column;
}

it might look a bit like this: https://gcdnb.pbrd.co/images/g93VC7Rbn06o.png?o=1