.center {
  position: absolute;
  place-self: anchor-center;
  margin-left: auto;
  margin-right: auto;
  width: 65%;
  padding: 10px;
}

.center-mobile {
  display: none;
}

/* Mobile screens (<= 600px) */
@media (max-width: 600px) {
  .center {
    display: none;
  }
  .center-mobile {
    display: inline-block;
    position: absolute;
    place-self: anchor-center;
    margin-left: auto;
    margin-right: auto;
    width: 65%;
    padding: 10px;
  }
}