#leftsid {
  position: fixed;
  margin-top: 20px;
  margin-left: 210px;
  z-index: 99;
}
#rightsid {
  position: fixed;
  margin-top: 20px;
  z-index: 99;
}

@media (max-height: 720px) {
  #leftsid, #rightsid {
    display: none;
  }
}