Poner un carter o flecha para Subir arriba

<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script>
jQuery(document).ready(function() {
var offset = 220;
var duration = 500;
jQuery(window).scroll(function() {
if (jQuery(this).scrollTop() > offset) {
jQuery('.back-to-top').fadeIn(duration);
} else {
jQuery('.back-to-top').fadeOut(duration);
}
});

jQuery('.back-to-top').click(function(event) {
event.preventDefault();
jQuery('html, body').animate({scrollTop: 0}, duration);
return false;
})
});
</script>

<style>
div#page {
max-width: 900px;
margin-left: auto;
margin-right: auto;
padding: 20px;
}

.back-to-top {
position: fixed;
bottom: 2em;
right: 0px;
text-decoration: none;
color: #000000;
background-color: rgba(153, 204, 255, 0.80);
font-size: 14px;
padding: 1em;
display: none;
}

.back-to-top:hover {
background-color: rgba(153, 204, 255, 0.50);
text-decoration: none;
}
</style>

<a href="#" class="back-to-top">Subir arriba</a>