.kaikei-wrapper{
  display:block;
  padding:10px;
  margin: 50px auto;
  background-color:rgba(155,149,201,0.4);
  border-radius: 10px;
}

.button a{
	box-sizing:border-box;
	display:inline-block;
	width:auto;
	height:auto;
	border-radius:10px;
	text-align:center;
	padding:10px;
	margin: 5px 5px;
	box-shadow: 4px 4px #1a7480;
	cursor:pointer;
}

.button :active{
	position:relative;
	box-shadow:none;
  top : 4px;
	left: 4px;
}