a.button {
    -webkit-appearance: button;
    -moz-appearance: button;
    appearance: button;

    text-decoration: none;
    color: initial;
}

div.center {
        text-align: center;
        font-size: 20px;
}

.center2 {
  padding: 70px 0;
  border: 3px solid green;
  text-align: center;
}