.whatsapp-button {
    position: fixed;
    right: 30px;
    bottom: 0px;
    transform: translate(-50%, -50%);
    /*background: #27a6e5;*/ /*цвет кнопки*/
    border-radius: 50%;
    width: 55px; /*ширина кнопки*/
    height: 55px; /*высота кнопки*/
    color: #fff;
    text-align: center;
    line-height: 53px; /*центровка иконки в кнопке*/
    font-size: 35px; /*размер иконки*/
    z-index: 9999;
}
.whatsapp-button a {
    color: #fff;
}
.whatsapp-button:before,
.whatsapp-button:after {
    content: " ";
    display: block;
    position: absolute;
    border: 50%;
    border: 1px solid #145ed8; /*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;
}
.whatsapp-button i {
    /*url('https://prometex.pro/images/tlg.svg');*/
  background: url('https://prometex.pro/images/f_max.svg');
    background-position-x: 0%;
    background-position-y: 0%;
    background-repeat: repeat;
  background-repeat: no-repeat;
  background-position: center;
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
    background-size: 40px;
}
 
@keyframes animate
{
    0%
    {
        transform: scale(0.5);
        opacity: 0;
    }
    50%
    {
        opacity: 1;
    }
    100%
    {
        transform: scale(1.2);
        opacity: 0;
    }
}
@media (max-width : 800px) {  
.whatsapp-button {   
    bottom: 0px;
    right: 25px;
  }
}