@keyframes animate-pulse{
    0%{box-shadow: 0 0 0 0 rgba(47, 119, 134, 0.5), 0 0 0 0 rgba(47, 119, 134, 0.5);}
    40%{box-shadow: 0 0 0 50px rgba(255,109,74,0.0),  0 0 0 0 rgba(47, 119, 134, 0.5);}
    80%{box-shadow: 0 0 0 50px rgba(255,109,74,0.0),  0 0 0 30px rgba(255,109,74,0);}
    100%{box-shadow: 0 0 0 0 rgba(255,109,74,0.0),  0 0 0 30px rgba(255,109,74,0);}
}

#btn-whatsapp {
    position:fixed;
    width: 3rem;
    height: 3rem;
    bottom: 40px;
    right: 40px;
    background-color: #009622;
    color: #FFF;
    border-radius: 50px;
    text-align: center;
    font-size: 30px;
    box-shadow: 1px 1px 2px #888;
    z-index: 1000;
    animation: animate-pulse 3s linear infinite;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
}

#btn-whatsapp i {
    font-size: 2rem;
    color: white;
}