.btn-whatsapp {
    display: block;
    width: 60px;
    height: 60px;
    background-color: #25d366;
    position: fixed;
    right: 20px;
    bottom: 25px;
    border-radius: 50%;
    line-height: 80px;
    text-align: center;
    z-index: 999;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.wicon {
    font-size: 48px;
    color: white;
    vertical-align: -3px;
}

@media only screen and (max-width : 992px) {
    .btn-whatsapp {
        right: 10px;
        bottom: 75px;
    }
}