.loader-wrapper{
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-size: cover;
  background-color: #333;
  z-index: 40;
  display:flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}
.loader {
  display: inline-block;
  width: 30px;
  height: 30px;
  position: relative;
  border: 4px solid #Fff;
  animation: loader 2s infinite ease;
  overflow: hidden;
}
.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);
  }
  25% {
    transform: rotate(180deg);
  }
  50% {
    transform: rotate(180deg);
  }
  75% {
    transform: rotate(360deg);
  }
  100% {
    transform: rotate(360deg);
  }
}