body {
  background: black;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

.close {
  background-image: url('../img/button_close.png');
  background-repeat: no-repeat;
  position: absolute;
  top: 5px;
  right: 5px;
  z-index: 1000;
  width: 17px;
  height: 17px;
  cursor: pointer;
  -webkit-app-region: no-drag;
}

.close:hover {
  background-image: url('../img/button_close_hover.png');
}