.btn-whatsapp a {
    color: #fff;
    text-decoration: none;
    display: block;
}

.btn-whatsapp {
    position: fixed;
    right: 10px;
    bottom: 100px;
    z-index: 200;
    transform: translate(-50%, -50%);
    background-color: rgb(37, 211, 102);
    width: 60px;
    height: 60px;
    text-align: center;
    line-height: 58px;
    font-size: 2em;
    color: #ffffff;
    font-weight: 100;
    border-radius: 50%;
}

.btn-whatsapp:before,
.btn-whatsapp:after {
    content: '';
    display: block;
    position: absolute;
    border-radius: 50%;
    border: 1px solid #25d366;
    left: -20px;
    right: -20px;
    bottom: -20px;
    top: -20px;
    animation: animate 1.5s linear infinite;
    opacity: 0;
    backface-visibility: hidden;
}

.pulsaDelay:after {
    animation-delay: .5s;
}

@keyframes animate {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }

    50% {
        opacity: 1;
    }

    100% {
        transform: scale(1.2);
        opacity: 0;
    }
}