img.btn-whatsapp {
    display: block !important;
    position: fixed;
    z-index: 9999999;
    bottom: 20px;
    right: 20px;
    cursor: pointer;
    border-radius: 100px !important;
}

img.btn-whatsapp:hover {
    border-radius: 100px !important;
    -webkit-box-shadow: 0px 0px 15px 0px rgba(7,94,84,1);
    -moz-box-shadow: 0px 0px 15px 0px rgba(7,94,84,1);
    box-shadow: 0px 0px 15px 0px rgba(7,94,84,1);
    transition-duration: 1s;
}