hladké rolovanie css
html {
scroll-behavior: smooth;
}
/* No support in IE, or Safari
You can use this JS polyfill for those */
http://iamdustan.com/smoothscroll/
javascript prejsť na začiatok stránky
window.scroll({top: 0, left: 0});
//Or with jQuery
$('html,body').scrollTop(0);
//with animation
$('html, body').animate({ scrollTop: 0 }, 'fast');