Realms invitation button hover area is offset

The bug

The hover area of the invitiation / mail button in the realms menu appears to be offset to the bottom right:

• The hover outline does not appear when the mouse is close to the left / upper border, but is still visible when the mouse it outside on the right / lower border
• The hover text only appears when the mouse is in the lower right area of the button

Additionally the hover text of the button ("No pending invites") is rendered behind the "Realms news" button.