smooth-scroll.js

$('a[href^="#"]').on('click', function(){
	var elementClick = $(this).attr("href");
	var destination = $(elementClick).offset().top;
	var minusTop = 0;
	switch(elementClick){
		case "#services": minusTop = 90; break;
		case "#portfolio": minusTop = 60; break;
		case "#advantages": minusTop = 90; break;
		case "#steps": minusTop = 60; break;
		case "#price": minusTop = 60; break;
		case "#contact": minusTop = 40; break;
	}


		$('html, body').animate( {scrollTop: destination-minusTop }, 1000 );
	return false;

});