.hover_btn {
		position: relative;
		display: inline-block;
		overflow: hidden;
		width: 135px;
		height: 110px;
		margin: 10px;
}
.hover_btn img {
	position: absolute;
	top: 0;
	right: 0;
	left: 0;
}
.hover_btn:hover img {
	top: auto;
	bottom: 0;
}