#myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  font-size: 18px;
  border: none;
  outline: none;
  /*background-color: #336A25;*/
  background-color: #0FABEC;
  color: white;
  cursor: pointer;
  /*padding: 15px;*/
  border-radius: 50%;
  height: 50px;
  width: 50px;
}

#myBtn:hover {
  background-color: #34BE82;
  /*color: #336A25;*/
}

@media only screen and (max-width: 600px) {

    #myBtn {
        font-size: 15px;
        padding: 10px;
    }
}