title: Changing the distance an internal link scrolls down the page
body: <p>Hi I've got a nav menu that changes to fixed once scrolled down the page a certain amount of pixels.
  Because the menu is fixed, it overlays the top cutting out the header of that section. </p>
  
  <p>I'm looking to affect how far the page moves when using the menu to move to a section on the page, so sort of negatively offset how far the page scrolls down to show all the menu aswell as section header if possible.</p>
  
  <p>Thanks!</p>