.bt--whatsapp {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 998;
    color: #fff;
    font-weight: normal;
    background: #25D366;
    height: 2.75862rem;
    width: 2.75862rem;
    line-height: 2.75862rem;
    border-radius: 1.37931rem;
    padding: 5px 12px;
    -webkit-box-shadow: #1fc45d 0 3px 0;
    box-shadow: #1fc45d 0 3px 0;
}

.bt--whatsapp:hover {
    background: #1fc45d;
    -webkit-box-shadow: #25D366 0 3px 0;
    box-shadow: #25D366 0 3px 0;
}