#postcode.form__field {
  border-left: 1px solid #878787 !important;
  border-top: 1px solid #878787 !important;
  border-bottom: 1px solid #878787 !important;
}

#postcode.form__field:focus {
  border-left: 2px solid #7b1e79 !important;
  border-top: 2px solid #7b1e79 !important;
  border-bottom: 2px solid #7b1e79 !important;
}