.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 100%
}
.button {
  background-color: #4CAF50; /* Green */
  border: none;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: block;
  font-size: 16px;
  margin-left: auto;
  margin-right: auto;
}
img {
  opacity: 0.0
}