Hello adriana4u,
I tried to find out a specific css for your requirement, looks like there is no css for making a div static on zoom in or out.

Thus, I tried a couple of tricks and one of them is working, mention below:

@media screen and (max-width: 1700px) {
.private-logo-link {
zoom: 100%;
}
}
@media screen and (max-width: 1600px) {
.private-logo-link {
zoom: 91%;
}
}
@media screen and (max-width: 1400px) {
.private-logo-link {
zoom: 80%;
}
}
@media screen and (max-width: 1200px) {
.private-logo-link {
zoom: 66.5%;
}
}
@media screen and (max-width: 1100px) {
.private-logo-link {
zoom: 65%;
}
}
@media screen and (max-width: 1000px) {
.private-logo-link {
zoom: 57%;
}
}
@media screen and (max-width: 900px) {
.private-logo-link {
zoom: 50%;
}
}

You must need to use media query and set the zoom size of a particular div. I hope that works.

Also, that's might not be a standard solution, you may have to test all your desktop sizes before make it live.