.btn-whatsapp a {

 color:#fff; 
 text-decoration:none; 
 display:block; 
}

.btn-whatsapp {
    position: fixed;
    width: 55px;
    height: 55px;
    bottom: 20px;
    left: 10px;
    background-color: #1fcc5e;
    color: #FFF;
    border-radius: 50px;
    text-align: center;
    font-size: 25px;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    text-decoration: none;
    box-shadow: 0px 0px 12px 3px rgba(217,245,243,0.75);
    -webkit-box-shadow: 0px 0px 12px 3px rgba(217,245,243,0.75);
    -moz-box-shadow: 0px 0px 12px 3px rgba(217,245,243,0.75);
}

.btn-whatsapp:hover {
    transform: scale(1.1);
}

.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; }

}