https://discovery.zp.ua/upTT.js

1$(document).ready(function() {
2	
3	// Âèäæåò êíîïêè ââåðõ (Test-Templates)
4	// Âåðñèÿ 1.0
5	
6	$('body').append('<div class="button-up" style="display: none;opacity: 0.7;width: 80px;height:100%;position: fixed;left: 0px;top: 0px;cursor: pointer;text-align: center;line-height: 30px;color: #d3dbe4;font-weight: bold;">íàâåðõ</div>');
7		
8	$ (window).scroll (function () {
9		if ($ (this).scrollTop () > 100) {
10			$ ('.button-up').fadeIn();
11		} else {
12			$ ('.button-up').fadeOut();
13		}
14	});
15	
16	$('.button-up').click(function(){
17		$('body,html').animate({
18            scrollTop: 0
19        }, 800);
20        return false;
21	});
22	
23	$('.button-up').hover(function() {
24			$(this).animate({
25				'opacity':'1',
26			}).css({'background-color':'#e7ebf0','color':'#6a86a4'});
27		}, function(){
28			$(this).animate({
29				'opacity':'0.7'
30			}).css({'background':'none','color':'#d3dbe4'});;
31	});
32		
33});