.whatsapp-button {
    position: fixed;
    bottom: 30px;
    left: 30px;
    width: 56px;
    height: 56px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    color: white !important;
    background-color: #25d366;
    border-radius: 100%;
    transition-duration: 0.5s;
    animation: whatsapp-button-pulse 3s infinite;
    z-index: 1030;
}
.whatsapp-button:hover {
    background-color: #128c7e;
}
@keyframes whatsapp-button-pulse {
    0% {
        -webkit-box-shadow: 0 0 0 0 rgba(37, 211, 102, 1);
    }
    70% {
        -webkit-box-shadow: 0 0 0 20px rgba(37, 211, 102, 0);
    }
    100% {
        -webkit-box-shadow: 0 0 0 0 rgba(37, 211, 102, 0);
    }
}