#myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  font-size: 18px;
  border: none;
  outline: none;
  background-color: rgb(0,123,255);
  color: white;
  cursor: pointer;
  padding: 10px;
  border-radius: 8px;
  opacity: .6;
}

#myBtn:hover {
  background-color: #555;
}

html {
  scroll-behavior: smooth;
}