#btt {
  display: none;
  position: fixed;
  bottom: 20px;
  z-index: 99;
  font-size: 40px;
  border: none;
  outline: none;
  background-color: #555;
  color: white;
  cursor: pointer;
  padding: 16px;
  border-radius: 4px;
}

#btt:hover {
  background-color: #ac0535;
}

@media screen and (max-width: 1000px){
  #btt {
  display: none;
  position: fixed;
  bottom: 10px;
  right: 75px;
}
}