.whatsapp {
    position:fixed;
    width:42px;
    height:42px;
    bottom:66px;
    right:12px;
    background-color:#25d366;
    color:#FFF;
    border-radius:50%;
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:21px;
    z-index:100;
    box-shadow:0 6px 20px rgba(20,40,80,.25);
  }

  .whatsapp-icon {
    margin-top:0;
    line-height:1;
  }

/* Botón "subir" alineado en columna con los botones flotantes */
.back-to-top {
    right: 12px !important;
    bottom: 12px !important;
    width: 42px !important;
    height: 42px !important;
    display: flex;
    align-items: center;
    justify-content: center;
}
.back-to-top i { font-size: 22px; }