SiteOrigin Button: Smooth Transition on Anchor Link

Hi everyone,

I made a page and use a SiteOrigin Button linking to a different section to the same page.
This works perfectly, of course, but the jump is abrupt and i would like to have a smooth transition.

So, what I did, is I gave a class to my button:

my-intern-link

And using the plugin ‘Simple Custom CSS and JS’, I have added this JS code:

jQuery(document).ready(function( $ ){
  // Smooth transition towards section on Menu click
  $(".my-intern-link").on("click", function(event){
    event.preventDefault();
    var hash = this.hash;
    $('body,html').animate({scrollTop: $(hash).offset().top} , 900 , function(){window.location.hash = hash;})
  });
});

And this code just doesn’t work at all, when i click on the button, it doesn’t even jump at the section anymore.

Is there a better way to to what i want to achieve, or is there any qwack in my code ?
Thanks in advance ^_^