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.scrollToTop {
    bottom: 15px;
    right: 12px;
    position: fixed;
    color: @sun-flower;
    display: none;

    &:hover {
        text-decoration: none;
        color: @orange;
    }

    &:visited {
        color: @sun-flower;
    }
}

//Check to see if the window is top if not then display button
$(window).scroll(function(){
    if ($(this).scrollTop() > 200) {
        $('.scrollToTop').fadeIn();
    } else {
        $('.scrollToTop').fadeOut();
    }
});

//Click event to scroll to top
$('.scrollToTop').click(function(){
    $('html, body').animate({scrollTop : 0}, 800);
    return false;
});

<a href="#" class="scrollToTop">
  <span class="h4">to top</span>
  <i class="fa fa-arrow-circle-up fa-3x fa-fw"></i>
</a>