footer {
  position: fixed; /* keeps it at the bottom */
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1000; /* stays above other content */
}



@media (max-height:840px) {
   footer {
    position: static;  /* or relative */
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  }}