#myBtn{
    background-color: black;
    display: none;
    margin: 0 auto;
    position: fixed;
    bottom: 80px;
    right: 25px;
    outline: none;
    border: none;
    cursor: pointer;
    padding: 15px;
    border-radius: 50%;
    z-index: 99;
    transition: 0.2s all ease;
  }
  .btn{
    background-position: center;
    background-image: url(../images/pra-cima.png);
    background-size: cover;
    width: 20px;
    height: 20px;
    transition: 0.2s all ease;
  }
  #myBtn:hover, #myBtn:hover .btn{
    padding: 15px;
  }

  #whats{
    margin: 0 auto;
    position: fixed;
    bottom: 20px;
    right: 25px;
    outline: none;
    border: none;
    cursor: pointer;
    border-radius: 50%;
    z-index: 99;
    transition: 0.2s all ease;
  }

  #whats  a > .btn{
    background-image: url(../images/whatsapp.png);
    background-position: center;
    background-size: cover;
    padding: 25px;
  }