.btn-whatsapp {
    position: relative;
    width: 50px;
    height: 50px;
    margin: 5px 0px;
    color: #fff;
    background: #27ae60;
    border-radius: 50px;
    display: flex;
    align-content: center;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    -webkit-transition: all linear 0.2s;
    -moz-transition: all linear 0.2s;
    -ms-transition: all linear 0.2s;
    -o-transition: all linear 0.2s;
    transition: all linear 0.2s;
}
.btn-whatsapp span {
    color: #fff;
    font-size: 2em;
    display: flex;
    -webkit-transition: all 0.2s ease;
    -moz-transition: all 0.2s ease;
    -ms-transition: all 0.2s ease;
    -o-transition: all 0.2s ease;
    transition: all 0.2s ease;
}
.btn-whatsapp span::before {
    margin-right: 0px;
}
.btn-whatsapp:hover {
    background: #2ecc71;
}
.btn-whatsapp:before {
    content: attr(data-tooltip);
    background-color: #000;
    color: #fff;
    font-size: 0.75em;
    padding: 10px;
    box-sizing: border-box;
    position: absolute;
    left: 0px;
    bottom: 50%;
    display: none;
    transition: all 0.4s ease;
    white-space: nowrap;
    transform: translate(-109%, 50%);
    border-radius: 4px;
}
.btn-whatsapp:after {
    content: "";
    position: absolute;
    display: none;
    width: 0;
    height: 0;
    left: 0;
    bottom: 50%;
    border-style: solid;
    border-width: 8px 8px 8px 8px;
    border-color: transparent transparent transparent #000;
    transition: all 0.4s ease;
    transform: translate(-100%, 50%);
}
.btn-whatsapp:hover:after,
.btn-whatsapp:hover:before {
    /*opacity: 1;*/
    display: flex;
}