Botão Voltar ao topo com efeito rolante

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FONTE ESPECIAL E JQUERY 
(colar abaixo de <head>)

<link href='https://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css' rel='stylesheet'/>
<script src='//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>

CÓDIGO CSS
(colar acima de ]]></b:skin>)


.smoothscroll-top {
    position:fixed;
    opacity:0;
    visibility:hidden;
    overflow:hidden;
    text-align:center;
    z-index:99;
    background-color:#2ba6e1;
    color:#fff;
    width:47px;
    height:44px;
    line-height:44px;
    right:25px;
    bottom:-25px;
    padding-top:2px;
    border-radius:5px;
    transition:all 0.5s ease-in-out;
    transition-delay:0.2s;
}
.smoothscroll-top:hover {
    background-color:#3eb2ea;
    color:#fff;
    transition:all 0.2s ease-in-out;
    transition-delay:0s;
}
.smoothscroll-top.show {
    visibility:visible;
    cursor:pointer;
    opacity:1;
    bottom:25px;
}
.smoothscroll-top i.fa {
    line-height:inherit;
}

CÓDIGO JAVASCRIPT
(colar acima de </body>)

<div class="smoothscroll-top">
    <span class="scroll-top-inner">
        <i class="fa fa-2x fa-arrow-circle-up"></i>
    </span>
</div>
<script type='text/javascript'>
//<![CDATA[
$(function(){

    $(document).on( 'scroll', function(){

        if ($(window).scrollTop() > 100) {
            $('.smoothscroll-top').addClass('show');
        } else {
            $('.smoothscroll-top').removeClass('show');
        }
    });

    $('.smoothscroll-top').on('click', scrollToTop);
});

function scrollToTop() {
    verticalOffset = typeof(verticalOffset) != 'undefined' ? verticalOffset : 0;
    element = $('body');
    offset = element.offset();
    offsetTop = offset.top;
    $('html, body').animate({scrollTop: offsetTop}, 600, 'linear');
}
//]]>
</script>


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