.custom-loader {
  width: 100px;
  height: 100px;
  border-radius: 100%;
  position: relative;
  margin: 0 auto;
}
.bar-loader{
    top: 40px;
    left: -2.5px;
}
.bar-loader span{
  display: inline-block;
  width: 5px;
  height: 20px;
  background-color: #3498db;
}

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

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

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

.bar-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);
  }
}