#root, #fiCenter {
  padding: 10pt;
  position: absolute;
  left: 50%;
  transform: translate(-50%);
}

#fiCenter {
  background: #FFF;
  top: 50%;
  transform: translate(-50%, -50%);
}

#fiBackground {
  display: none;
  position: fixed;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
}