You can change the color by going to System>Administration>Login Window. Under the "Local" tab, there is a button to change your background color. Please respond to this comment and close this bug (mark as Invalid) because this is more of a support question than bug. Thanks.
You can change the color by going to System> Administration> Login Window. Under the "Local" tab, there is a button to change your background color. Please respond to this comment and close this bug (mark as Invalid) because this is more of a support question than bug. Thanks.