[Stripe] Add custom Stripe Elements styles using the `wc_stripe_elements_styling` filter. Add this to your custom child theme functions.php

wc-stripe-elements-styling-filter.php

// Stripe provides a filter for you to add custom Stripe Elements Styling
// See full documentation from Stripe on what elements are available to be styled here:
// https://stripe.com/docs/stripe-js/reference#element-options

add_filter( 'wc_stripe_elements_styling', 'woogist_add_stripe_elements_styles' );
function woogist_add_stripe_elements_styles($array) {
	$array = array(
		'base' => array( 
			'color' 	=> '#bada55',
			'fontFamily' 	=> 'Tahoma',
			'fontSize' 	=> '30px'
		),
		'invalid' => array(
			'color'		=> '#0099e5'
		)
	);
	return $array;
}

Where this code should be placed? Help me plz.

Where this code should be placed? Help me plz.

We placed this in our file that has custom functionality for Woocommerce, for example, themes/my-theme/lib/woocommerce-checkout.php