Help! How to style form input fields

[iWpress]

braintree_php
Hello, could you please tell me how to change the character color in the input fields of the 'dropin-container' form? I tried

.braintree-form__field {
	.braintree-form__hosted-field {
		input.braintree-form__raw-input {
			color: rgb(255, 255, 255) !important;
        }
    }
}

didn't help?