.loader-bg{
  position: fixed;
  z-index: 99999;
  background-color: #ecf0f1;
  width: 100%;
  height: 100%;
}

.loader{
  border: 0 solid transparent;
  border-radius: 50%;
  width: 150px;
  height: 150px;
  position: absolute;
  top: calc(50vh - 75px);
  left: calc(50vw - 75px);
}

.loader:before, .loader:after{
  content: '';
  border: 1em solid #95a5a6;
  border-radius: 50%;
  width: inherit;
  height: inherit;
  position: absolute;
  top: 0;
  left: 0;
  animation: loader 2s linear infinite;
  opacity: 0;
}

.loader:before{
  animation-delay: .5s;
}

@keyframes loader {
  0%{transform:scale(0);opacity: 0;}
  50%{opacity: 1;}
  100%{transform:scale(1);opacity: 0;}
}