.loader-visible{
  display: block;
}
.loader-gone{
  display: none;
}
.loader .loader:after {
  border-radius: 50%;
  width: 30px;
  height: 30px;
}
.loader {
  margin: 20px auto;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border-top: 3px solid rgba(31,137,127, 0.2);
  border-right: 3px solid rgba(31,137,127, 0.2);
  border-bottom: 3px solid rgba(31,137,127, 0.2);
  border-left: 3px solid #1f897f;
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-animation: loading 1.1s infinite linear;
  animation: loading 1.1s infinite linear;
}
@-webkit-keyframes loading {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes loading {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}