.float {
  position: fixed;
  width: 60px;
  height: 60px;
  bottom: 15px;
  right: 59px;
  background-color: #4cc370;
  color: #fff;
  border-radius: 50px;
  text-align: center;
  font-size: 30px;
  box-shadow: 2px 2px 3px #999;
  z-index: 100;
}
.float:hover {
  text-decoration: none;
  color: #fff;
  background-color: #3d9e5a;
}

.float .my-float {
  margin: 25%;
}