.btn-wsp{
    position:fixed;
    width:55px;
    height:55px;
    line-height: 55px;
    bottom:75px;
    right:20px;
    background:#25d366;
    color:#FFF;
    border-radius:50px;
    text-align:center;
    font-size:48px;
    box-shadow: 0px 10px 10px rgba(0,0,0,0.3);
    z-index:100;
    transition: all 300ms ease;
}
.btn-wsp:hover{
    text-decoration: none;
    color: #20ba5a;
    background:#FFF;
}
@media only screen and (min-width:320px) and (max-width:768px){
    .btn-wsp{
        width:55px;
        height:55px;
        line-height: 55px;
	}
}