Run ScrollTop with offset of element by ID

jQuery(function($) {
  $('a[href*="#"]:not([href="#"])').click(function() {
      var target = $(this.hash);
        $('html,body').stop().animate({
          scrollTop: target.offset().top - 120
        }, 'linear');   
  });    
    if (location.hash){
    var id = $(location.hash);
    }
    $(window).on('load', function() {
    if (location.hash){
        $('html,body').animate({scrollTop: id.offset().top -120}, 'linear')
    };
    });
});

this worked for me.

No magic involved, just subtract from the offset top of the element

$('html, body').animate({scrollTop: $('#contact').offset().top -100 }, 'slow');