Button Up

index.html

<div id="button-up" class="button-up">
   <i class="fa fa-chevron-up" aria-hidden="true"></i>
</div>

main.css

.button-up {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #28108c;
  position: fixed;
  bottom: 70px;
  right: 70px;
  cursor: pointer;
  z-index: 100;
  text-align: center;
  transition: all .5s ease;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
}
.button-up:hover {
  background: #000;
}
.button-up i {
  color: #fff;
  margin-top: 14px;
}
//Media CSS
.button-up {
  bottom: 40px;
  right: 40px;
  width: 40px;
  height: 40px;
}
.button-up i {
  margin-top: 12px;
  font-size: 13px;
}

main.js

$(window).scroll(function(){
  if($(this).scrollTop() > 800) {
      $('#button-up').fadeIn();
  }
  else {
      $('#button-up').fadeOut();
  }
});
$('#button-up').click(function () {
    $('html, body').animate( {scrollTop: 0 }, 600 );
    return false;
});