How to add custom class to WooCommerce checkout field?

I’m trying to add a custom class to input HTML tag at a checkout page in WooCoomerce.

For example:
I want to add .smartform-zip to input with name billing_postcode and same thing with billing_adress_1 and city. How can I do? I try to write some hooks or customize some code on GitHub and nothing work.

I need it for autocomplete Czech service to customers address.

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