/* 丸ボタン(大)が回転します */

a.btn_marub {
	display: block;
	text-align: center;
	text-decoration: none;
	color: #FF5722;
	width: 120px;
	height: 120px;
	line-height: 120px;
	border: double 4px #FF5722;
	border-radius: 50%;
	vertical-align: middle;
	overflow: hidden;
	transition: .6s;
}
a.btn_marub:hover {
	transform: rotateY(360deg);
}