.open-button {
    background-image: url(../images/whatsapp/wapp.png);
    background-position: center;
    background-size: cover;
    border: none;
    cursor: pointer;
    opacity: 1;
    position: fixed;
    bottom: 100px;
    right: 28px;
    width: 105px;
    height: 120px;
    z-index: 100;
}

@media (min-width: 991.98px) {
  .open-button {
      
      right: 8px;
      bottom: 250px;
      
    
  }
}

@media screen and (-webkit-min-device-pixel-ratio: 0) and (min-width: 991.98px) {
  .open-button {
      
        right: 8px;
        bottom: 250px;
    
  }
}