#dragBox {
  border: #ff0000 1px solid;
  z-index: 5;
  visibility: hidden;
  position: absolute;
  width: 0;
  height: 0;
  font-size: 0px; }

a.btn img { border: 0; background-color: #ccc; }

a.btn:hover img { background-color: #f8c337; }

a.btn_active img { border: 0; background-color: red; }