.float{
    position:fixed;
    height:100px;
    bottom:40px;
    right:40px;
    border-radius:50px;
    text-align:center;
  font-size:30px;
  z-index:100;
}

.my-float{
    margin-top:16px;
}

@media only screen and (max-width: 450px) {
  .float{
    position:fixed;
    height:80px;
    bottom:10px;
    right:10px;
    border-radius:50px;
    text-align:center;
  font-size:30px;
  z-index:100;
}

.my-float{
    margin-top:16px;
}
}

@media only screen and (min-width: 1240px) {
  .float{
    position:fixed;
    height:100px;
    bottom:15px;
    right:15px;
    border-radius:50px;
    text-align:center;
  font-size:30px;
	  z-index:100;
}

.my-float{
    margin-top:16px;
}
}