.newsletter-form__field-wrapper .field:after {
  box-shadow: none;
  border: 0;
}

.newsletter-form__field-wrapper .field:hover.field:after {
  box-shadow: none;
  border: 0;
}

.newsletter-form__field-wrapper .field__input:focus {
  box-shadow: none;
  border: 0; 
}