#whatsapp .wtsapp {
    position: fixed;
    transform: all .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: 60px;
    right: 25px;
    border: 0;
    z-index: 9999;
    width: 50px;
    height: 50px;
    line-height: 50px;
}

#whatsapp .wtsapp:before {
    content: "";
    position: absolute;
    z-index: -1;
    left: 50%;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
    display: block;
    width: 60px;
    height: 60px;
    background-color: #25d366;
    border-radius: 50%;
    -webkit-animation: pulse-border 1500ms ease-out infinite;
    animation: pulse-border 1500ms ease-out infinite;
}
#whatsapp .wtsapp:focus {
    border: none;
    outline: none;
}

@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;}
}