in js/custom.js [498:510]
$('.PortfolioStickyMenu ul li a').click(function(e){
var targetId = $(this).attr('href');
var offset = $(targetId).offset() ;
var variation = ($('.navbar-fixed-top').length)?$('.navbar-fixed-top').outerHeight(true) +20:90;
var finalPos = offset.top - variation;
scrollTo(finalPos , 500);
e.preventDefault();
});