.loader {
  width: 100%;
  height:100%;
  z-index:100000;
  position: absolute;
  background-color: rgba(0,0,0,0.85);
  border-radius: 0px;
}

.loader_group {
  position: fixed;
  top: 45%;
  left: 50%;
  transform: translate(-45%, -50%);
  -webkit-transform: translate(-45%, -50%);
  -moz-transform: translate(-45%, -50%);
  -o-transform: translate(-45%, -50%);
}

#loader span{
  display: inline-block;
  width: 5px;
  height: 20px;
  background-color: #91172E;
}

#loader span:nth-child(1){
  animation: grow 1s ease-in-out infinite;
}

#loader span:nth-child(2){
  animation: grow 1s ease-in-out 0.15s infinite;
}

#loader span:nth-child(3){
  animation: grow 1s ease-in-out 0.30s infinite;
}

#loader span:nth-child(4){
  animation: grow 1s ease-in-out 0.45s infinite;
}

@keyframes grow{
  0%, 100%{
    -webkit-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -o-transform: scaleY(1);
    transform: scaleY(1);
  }

  50%{
    -webkit-transform: scaleY(1.8);
    -ms-transform: scaleY(1.8);
    -o-transform: scaleY(1.8);
    transform: scaleY(1.8);
  }
}