/* footer */

#myBtntop {
    display: none;
    z-index: 99;
    position: fixed;
    bottom: 107px;
    right: 0px;
    width: 70px;
    height: 77px;
    font-size: 4em;
    border: none;
    outline: none;
    background-color: #009;
    color: #f90;
    cursor: pointer;
    padding: 0;
    margin: 0;
    border-radius: 50%;
  }
  
  #myBtntop:hover {
    background-color: #f90;
    color: #009;
  }