.centerdiv {
  position: absolute;
  /*width: 100%;*/
  /*height: 650px;*/
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  /*         margin-left: -150px;
  margin-top: -150px;
  /*max-width: 100%;*/
}

@media (max-width: 576px) {
  .centerdiv {
    width: 100%;
  }
}