#popupcontatti a {
    position: fixed;
    z-index: 890;
    left: auto;
    float: left;
    bottom: 25px;
    cursor: pointer;
    min-width: 45px;
    max-width: 150px;
    color: #fff;
    text-align: center;
    padding: 10px;
    margin: 0 auto 0 auto;
    background: #20b038;
    -webkit-transition: All .5s ease;
    -moz-transition: All .5s ease;
    -o-transition: All .5s ease;
    -ms-transition: All .5s ease;
    transition: All .5s ease;
    border-radius: 4px;
}