css for login in other languages not nice

using windows, Firefox 3.5.5 with German language support the field for the username is not on the spot.
With Linux it works however.
As a workaround I extented the width from 90px to 180px

#block-user-0 #user-login-form .form-item {
float:left;
margin:10px 0;
width:180px; # bevor 90px

openid looks nicer than too.