.btn-wsp{
    position:fixed;
    width:70px;
    height:70px;
    line-height: 70px;
    bottom:20px;
    left:30px;
    background:#1eff05;
    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:70px;
        height:70px;
        line-height: 73px;
	}
}