@keyframes loader {
  0% {
    transform: rotate(0deg);
  }

  25% {
    transform: rotate(180deg);
  }

  50% {
    transform: rotate(180deg);
  }

  75% {
    transform: rotate(360deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes loader-inner {
  0% {
    height: 0%;
  }

  25% {
    height: 0%;
  }

  50% {
    height: 100%;
  }

  75% {
    height: 100%;
  }

  100% {
    height: 0%;
  }
}

.loader-inner {
  vertical-align: top;
  display: inline-block;
  width: 100%;
  animation: loader-inner 2s infinite ease-in;
}

.loader {
  display: block;
  width: 30px;
  height: 30px;
  position: relative;
  border-width: 4px;
  border-style: solid;
  -webkit-animation: loader 2s infinite ease;
  animation: loader 2s infinite ease;
 }

.loader.modal-loader {
  margin: 60px auto;
}