INTRODUCTION
With the release on 13 July 2008 a border was added to the Sign In / Sign Up box on the main page of your social network. This was intended to make it easier for visitors to find the Sign Up link. If you’d like to remove it simply, apply this CSS to the Advanced panel of the Design Studio on your network.
THE CODE
.xg_signup, .account-links {
border-width:0px !important;
}