#overlay {
  background: #000;
  color: #666666;
  position: fixed;
  height: 100%;
  width: 100%;
  z-index: 5000;
  top: 0;
  left: 0;
  float: left;
  text-align: center;
  padding-top: 25%;
  opacity: .80;
}

.spinner {
    margin: 0 auto;
    height: 64px;
    width: 64px;
    animation: rotate 0.8s infinite linear;
    border: 5px solid firebrick;
    border-right-color: transparent;
    border-radius: 50%;
}

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}