.loader-wrapper {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-color: black;
  display:flex;
  justify-content: center;
  align-items: center;
  z-index: 10000;
}
.loader {
  display: block;
  position: relative;
  animation: loader 1s infinite ease;
}
.loader-inner {
  vertical-align: top;
  display: inline-block;
  width: 100%;
  background-color: #fff;
  animation: loader-inner 2s infinite ease-in;
}
@keyframes loader {
  0% { transform: rotate(0deg);}
  100% { transform: rotate(360deg);}
}
@keyframes loader-inner {
  0% { height: 0%;}
  100% { height: 0%;}
}