.whatsapp-button {
    background: url(https://yt3.ggpht.com/ytc/AKedOLSPsmamzmcWY-wrxWVXN-gZfzF0MrWvwL3WQN5xyg=s900-c-k-c0x00ffffff-no-rj);
    background-size: cover;
    position: fixed;
    right: 25px;
    bottom: 65px;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    width: 55px; /*ширина кнопки*/
    height: 55px; /*высота кнопки*/
    color: #fff;
    z-index: 9999;
}
.whatsapp-button a {
    color: #fff;
}
.whatsapp-button:before,
.whatsapp-button:after {
    content: " ";
    display: block;
    position: absolute;
    border: 50%;
    border: 1px solid #25D366; /*цвет анимированных волн от кнопки*/
    left: -20px;
    right: -20px;
    top: -20px;
    bottom: -20px;
    border-radius: 50%;
    animation: animate 1.5s linear infinite;
    opacity: 0;
    backface-visibility: hidden; 
}
 
.whatsapp-button:after{
    animation-delay: .5s;
}
 
@keyframes animate
{
    0%
    {
        transform: scale(0.5);
        opacity: 0;
    }
    50%
    {
        opacity: 1;
    }
    100%
    {
        transform: scale(1.2);
        opacity: 0;
    }
}

@media screen and (max-width: 980px) {
  .whatsapp-button {
    visibility: hidden;
    display: none;
  }
}