LoginPress | WordPress.org

Hey @chengjianping

You can use custom CSS for this purpose.

Copy and paste your custom CSS code in LoginPress -> Customizer -> Custom CSS/JS -> CSS, publish and enjoy.
Although, Moving to the left will require CSS, I am writing a snippet however do change it to your taste.

#login{
    margin-left: 2%;
}
@media screen and (max-width: 767px) {
   #login{
        margin-left: auto;    
        margin-right: auto;    
    }
    
}

Have a nice day!