#myCloseBtn {
    bottom: 190px;
    background-color: rgba(255,0,0,0.4);
    color: #1878a6;
    font-size: 20px;
}

#myCloseBtn:hover {
    background:#1878a6;
    color:#fff;
}


@media (max-width: 1200px){
  #myCloseBtn { bottom:175px; }
}

@media (max-width: 1100px){
  #myCloseBtn { bottom:165px; }
}

@media (max-width: 900px){
  #myCloseBtn { bottom:150px; }
}

@media (max-width: 600px){
  #myCloseBtn { bottom:135px; }

  #myCloseBtn:hover{
    transform:none;
  }
}