Greasy Fork

This is nice, but I think hiding the entire .global-navigation is a bit too much because you cannot even sign in or out anymore. I modified your script like the following, but maybe the visibility of .global-navigation should be toggled by hovering and leaving the mouse cursor:

.global-navigation__top {
    visibility: hidden;
}

I was able to get a pretty good view with:

.global-navigation__top {
    visibility: hidden;
}
.global-navigation__bottom {
    visibility: visible;
    background-color: transparent
}