Hi Max,
Thanks for reaching out.
Try the following CSS
.nav > li > a {
padding: 10px 7px;
}
nav.navbar a {
font-size: 12px;
font-weight: 400;
}
#navigation.scroll-fix {
z-index: 3 !important;
}
Copy and paste it in Appearance -> Customize -> Additional CSS
Let us know if you have any questions
Best Regards