Gravity Form Styling First Last Name Field

I want to ask simple question: How to styling First Last Name Advanced Field of Gravity Forms?

I use 2 advanced field:

Name field : First Name - Last Name

Email field : Email - Konfirm Email

I use this code and add it to style.css of wordpress child theme:

#gform_wrapper_2 .gform_body .gform_fields .gfield .ginput_complex .ginput_left label {font-size:14px; font-weight:bold;}
#gform_wrapper_2 .gform_body .gform_fields .gfield .ginput_complex .ginput_right label {font-size:14px; font-weight:bold;}

result: only affect Email field

and then I change code to:

body .gform_wrapper .gform_body .gform_fields #field_2_1.gfield .ginput_complex .ginput_left label {font-size:14px; font-weight:bold;}
body .gform_wrapper .gform_body .gform_fields #field_2_1.gfield .ginput_complex .ginput_right label {font-size:14px; font-weight:bold;}
body .gform_wrapper .gform_body .gform_fields #field_2_2.gfield .ginput_complex .ginput_left label {font-size:14px; font-weight:bold;}
body .gform_wrapper .gform_body .gform_fields #field_2_2.gfield .ginput_complex .ginput_right label {font-size:14px; font-weight:bold;}

result: still.. only affect Email field

to all nice people at stackoverflow.. please help. Thank you