.small_b {
	position: fixed;
	right: 20px;
	bottom: 50px;
	z-index: 50;
	width: 60px;
	height: 60px;
	_position: absolute;
	_bottom: auto;
}

.small_b .gotop {
	position: relative;
	z-index: 1;
	display: none;
	height: 60px;
	width: 60px;
	cursor: pointer;
	transition: 3s;
}