#myBtn {

    display: none;

    position: fixed;

    bottom: 20px;

    right: 20px;

    z-index: 99;

    font-size: 20px;

    border: none;

    outline: none;

    background-color: rgba(0,0,0,.5);

    color: white;

    cursor: pointer;

    padding: 0px 15px 0px 15px;

    border-radius: 4px;

    font-weight: bold;

    border-color: #FFF;

    border-width: 1px;

    border-style: solid;

  }

  

  #myBtn:hover {

    background-color: #A31459;

    color: #FFF;

  }