.btn-wsp {
  position: fixed;
  width: 60px;
  height: 60px;
  line-height: 63px;
  bottom: 65px;
  right: 25px;
  background: #25d366;
  color: #FFF;
  border-radius: 50px;
  text-align: center;
  font-size: 35px;
  box-shadow: 0px 1px 10px rgba(0,0,0,0.3);
  z-index: 100;
  transition: all 300ms ease;
}

.btn-wsp:hover {
  background: #20ba5a;
}

@media only screen and (min-width:320px) and (max-width:768px) {
  .btn-wsp {
    width: 63px;
    height: 63px;
    line-height: 66px;
  }
}

* {
  margin: 0;
  padding: 0;
  list-style: none;
  text-decoration: none;
}