Change Login Link Text Size in Mobile Navigation

Site URL: https://caper-harpsichord-tasl.squarespace.com/

I'd like to make a few updates to the mobile navigation slideout menu. I was able to change the font size of the regular navigation items but not able to change the size of the Login menu item. I'd also like to remove the blank space between the first menu item and the header. Thank you!

url: https://caper-harpsichord-tasl.squarespace.com/
pw: art

Use this CSS (Design > Custom CSS)

nav.header-menu-nav-list span.unauth {
    font-size: 14px;
}