img {
  max-width: 100%;
  height: auto;
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.button {
  background-color: #fff;
  -webkit-transition-duration: 0.4s;
  /* Safari */
  transition-duration: 0.4s;
  font-size: 16px;
}

.button:hover {
  background-color: rgb(57, 110, 57);
  /* Green */
  color: white;
}

.closeBtn {
  color: #a5a2a2;
  float: right;
  font-size: 30px;
}

.closeBtn:hover,
.closeBtn:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}