.loading {
  width: 100%;
  margin: 0;
  padding: 0;
}
.loading.hide {
  opacity: 0;
  pointer-events: none;
  transition: opacity 500ms;
}
.loading .circle {
  display: block;
  position: relative;
  top: calc( 50% - 20px );
  width: 40px;
  height: 40px;
  margin: 0 auto;
  border: 7px solid #444444;
  border-top: 7px solid #5ae1e5;
  border-radius: 50px;
  animation: loading 700ms linear 0ms infinite normal both;
}
@keyframes loading {
  0% { transform: rotate( 0deg ); }
  100% { transform: rotate( 360deg ); }
}