.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-top: 1em;
  width: 500px;
}
h1,h2,h3 {
  text-align: center;
}

.button {
    display: block;
    width: 230px;
    height: 25px;
    background: #4E9CAF;
    padding: 10px;
    margin: 0 auto;
    text-align: center;
    border-radius: 5px;
    color: white;
    font-weight: bold;
    line-height: 25px;
}

.button:hover {
    background: #2f2727;
    text-decoration: none;
}

.box {
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-top: 1em;
  width: 500px;
  border: 1px solid #000;
  padding: 10px;
  border-radius: 5px;
  background-color: #f2f2f2;
}