.phone_fixed_btn {
  display: none;
  position: fixed;
  right: 20px;
  bottom: 85px;
  width: 75px;
  height: 75px;
  padding: 0px;
  border-radius: 50%;
  background: url(/images/phone_fixed_btn.png);
  /*box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.25), 0px 4px 8px rgba(0, 0, 0, 0.16);*/
  z-index: 999;
}

@media screen and (max-width: 768px) {
  .phone_fixed_btn {
    display: block;
  }
}