#go_top
{
	cursor: pointer;
	position: fixed;
	bottom: 2em;
	right: 2em;
	background-color: rgba(0,0,0,0);
	background-position: center center;
	background-repeat: no-repeat;
	background-size: 100% 100%;
	background-image: url('go_top.png');
	opacity: 0.6;
	display: none;
	border-radius: 19px;
	-webkit-border-radius: 19px;
	-moz-border-radius: 19px;
	width: 38px;
	height: 38px;
	z-index: 9999;
	transition: opacity .25s ease-in-out;
	-moz-transition: opacity .25s ease-in-out;
	-webkit-transition: opacity .25s ease-in-out;
	-o-transition: opacity .25s ease-in-out;
	-ms-transition: opacity .25s ease-in-out;
}
#go_top:hover
{
	opacity: 1;
}