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/**
	 * The "Back-to-Top" Button.
	 */
	$('.back-to-top').click(function(e){
	
		$('body, html').animate( { scrollTop: 0 } , 1000 , 'easeInOutCirc' );
		e.preventDefault();
	
	});
	
	$('.back-to-top').hide();
	$(window).scroll(function(){
		
		var window_width = $(window).width();
	
		if( $(this).scrollTop() > 250 && window_width > 1024 ){
			$(".back-to-top").fadeIn();
		} else {
			$(".back-to-top").fadeOut();
		}
	
	});

<a href="#" class="back-to-top"><i class="fa fa-angle-up"></i></a>