.loadingBack {
  z-index: 20000;
  opacity: 0.3;
  position: absolute;
  top: 0;
  left: 0;
  background-color: grey;
  height: 100%;
  width: 100%;
}

.loading {
  position: absolute;
  z-index: 20001;
  top: 50%;
  left: 50%;
  z-index: 5000;
  -ms-transform: translate(-50%, -50%);
  /* IE 9 */
  -webkit-transform: translate(-50%, -50%);
  /* Safari */
  transform: translate(-50%, -50%);
  /* Standard syntax */
}

.loading .loading-bar {
  display: inline-block;
  width: 4px;
  height: 25px;
  border-radius: 4px;
  animation: loading 1s ease-in-out infinite;
  z-index: 5000;
}

.loading .loading-bar:nth-child(1) {
  background-color: green;
  margin-right: 2px;
  animation-delay: 0;
}

.loading .loading-bar:nth-child(2) {
  background-color: darkcyan;
  margin-right: 2px;
  animation-delay: 0.09s;
}

.loading .loading-bar:nth-child(3) {
  background-color: blue;
  margin-right: 2px;
  animation-delay: 0.18s;
}

.loading .loading-bar:nth-child(4) {
  background-color: #222;
  margin-right: 2px;
  animation-delay: 0.27s;
}

@keyframes loading {
  0% {
    transform: scale(1);
  }

  20% {
    transform: scale(1, 2.5);
  }

  40% {
    transform: scale(1);
  }
}