.float{
    position:fixed;
    width:70px;
    height:70px;
    bottom:30px;
    left: 30px;
    background-color:#25d366;
    color:#FFF;
    border-radius:70px;
    text-align:center;
 font-size:30px;
    box-shadow: 2px 2px 3px #999;
 z-index:100;
}
.float:hover {
    text-decoration: none;
    color: #25d366;
 background-color:#fff;
}

.my-float{
    margin-top:20px;
}