Hi Andrea,
There are classes available that will allow you to skin both the login module and the login page or individually.
To skin both of them use the parent selector 'logincontrol'. To skin just the login module, use the parent selector 'loginmodule'. To skin just the login page, use the parent control 'login'. Examples below:
Skinning both the module and the page:
.logincontrol .settingrow{font-size: 1.3em;}
Skinning only the Sign-In module:
.loginmodule .settingrow{font-sze: 1.3em;}
Skinning only the Sign-In page:
.login .settingrow {font-size: 1.3em;}
HTH,
Joe D.