.btn a {
  width: 100px;
  background-color: #ccc;
  border-radius: 4px;
  color: #000;
  display: block;
  font-size: 0.7rem;
  font-family: Meiryo;
  text-align: center;
  text-decoration: none;
  margin: 1px auto;
  padding: 10px 0px;
  box-shadow: 0 5px 0 rgba(0,0,0,0.3);
  margin-left: 5px;
  margin-right: 5px;
  padding-left: 7px;
  padding-right: 7px;
}

.btn a:hover {
 box-shadow: none; 
background-color: #ff0000;
color: #fff;
  transform: translate3d(0, 5px, 0);
  transition-duration: 0.3s;
  opacity: 0.8; 
  border: 1px solid #000fff;
  }