#whatsapp .whatsapp {
    position: fixed;
    transition: all 0.5s ease;
    background-color: #25d366;
    display: block;
    text-align: center;
    box-shadow: 0 0 20px rgba(0,0,0,0.15);
    border-radius: 50px;
    border-right: none;
    color: #fff;
    font-weight: 700;
    font-size: 30px;
    bottom: 30px;
    left: 30px;
    border: 0px;
    z-index: 9999;
    width: 50px;
    height: 50px;
    line-height: 50px;
}

#whatsapp .whatsapp:before {
    content: "";
    position: absolute;
    z-index: -1;
    left: 50%;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
    display: block;
    width: 50px;
    height: 50px;
    background-color: #25d366;
    border-radius: 50px;
    -webkit-animation: pulse-border 1500ms ease-out infinite;
    animation: pulse-border 1500ms ease-out infinite;
}

@keyframes pulse-border {
    0%	 { transform: translateX(-50%) translateY(-50%) translateZ(0) scale(1); opacity: 1; }
    100%  { transform: translateX(-50%) translateY(-50%) translateZ(0) scale(1.5); opacity: 0; }
}