.btn-whatsapp-pulse {
    z-index: 1000;
    background: #25d366;
    color: white;
    position: fixed;
    bottom: 20px;
    left: 20px;
    font-size: 40px;
    display: flex !important;
    justify-content: center;
    align-items: center;
    width: 0;
    height: 0;
    padding: 35px;
    text-decoration: none;
    border-radius: 50%;
    animation-name: pulse;
    animation-duration: 1.5s;
    animation-timing-function: ease-out;
    animation-iteration-count: infinite;
}

.btn-whatsapp-pulse:hover {
    color: #000000 !important;
}

.btn-whatsapp-pulse i {
    animation-name: pulse;
    animation-duration: 1.5s;
    animation-timing-function: ease-out;
    animation-iteration-count: infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.5);
    }
    40% {
        box-shadow: 0 0 0 7px rgba(37, 211, 102, 0.25);
    }
    80% {
        box-shadow: 0 0 0 14px rgba(37, 211, 102, 0);
    }
}

.btn-whatsapp-pulse-border {
    /*animation-play-state: paused;*/
}

.btn-whatsapp-pulse-border::before {
    content: "";
    position: absolute;
    border-radius: 50%;
    padding: 25px;
    border: 5px solid #25d366;
    opacity: 0.75;
    animation-name: pulse-border;
    animation-duration: 1.5s;
    animation-timing-function: ease-out;
    animation-iteration-count: infinite;
}

@keyframes pulse-border {
    0% {
        padding: 25px;
        opacity: 0.75;
    }
    75% {
        padding: 50px;
        opacity: 0;
    }
    100% {
        opacity: 0;
    }
}