.hw-back-to-top{position:fixed;bottom:25px;right:25px;width:40px;height:40px;display:block;z-index:1000;display:none;text-decoration:none;border-radius:3px;-webkit-border-radius:3px;-moz-border-radius:3px;background:rgba(0, 0, 0, 0.5)}.hw-back-to-top i{color:#FFFFFF;font-size:30px;position:relative;left:5px;bottom:0;margin:0;-webkit-transition:all 0.3s ease;-moz-transition:all 0.3s ease;-ms-transition:all 0.3s ease;-o-transition:all 0.3s ease;transition:all 0.3s ease}.hw-back-to-top:hover i{bottom:5px}