.taiken{
  background-color: #456a9c;
  color: #ffffff;
  padding: 4px;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  text-decoration: none;
  transition: background-color 0.3s ease;
}

.taiken:hover{
  background-color: #5880b4;
}