#content-wrapper{
    flex: auto;
}

.l-center-box{
    display: flex;
    justify-content: center;
    align-items: center;
}

.l-horizontal-center{
    display: flex;
    justify-content: center;
}

header div.logo-box, nav{
    display: flex;
    align-items: center;
}

header div.logo-box{
    flex: 0 1 20%;
}

header nav{
    flex: 0 10 80%;
    justify-content: flex-end;
}