Replace phone number in Header Subtitle on individual page - Montauk 7.0

Site URL: https://www.healthybabieshappymoms.com/montana

Hi,

I'm looking to replace the phone number displayed in the Header Subtitle section with another phone # on one specific page. I'm using the Montauk Template on 7.0. Can someone help me write the code for this?

Thanks

Edit Montana Page >> Add a Code Block (anywhere) >> paste this code

<style>
  .site-phone {
    font-size: 0;
}

.site-phone:before {
    content: "012-345-678";
    font-size: 16px;
}
</style>