.htt-loading-overlay
{
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;

  background: white;
  z-index: 1;

  opacity: 0;
  transition: 0.3s ease opacity;
}

.htt-loading-overlay--absolute {
  position: absolute;
}

.htt-loading-overlay--visible
{
  opacity: 1;
}

.htt-loading-overlay__circle-1,
.htt-loading-overlay__circle-2,
.htt-loading-overlay__circle-3
{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.htt-loading-overlay__circle-1::before,
.htt-loading-overlay__circle-2::before,
.htt-loading-overlay__circle-3::before
{
  content: ' ';
  display: inline-block;

  height: 20px;
  width: 20px;
  background: #ececec;
  border: 1px solid #bbbbbb;
  border-radius: 50%;

  animation-duration: 1.5s;
  animation-name: htt-loading-overlay__circle-keyframes;
  animation-iteration-count: infinite;
}

.htt-loading-overlay__circle-1
{
  left: calc(50% - 40px);
}

.htt-loading-overlay__circle-1::before
{
  animation-delay: 0s;
}

.htt-loading-overlay__circle-2
{
  left: 50%;
}

.htt-loading-overlay__circle-2::before
{
  animation-delay: 0.2s;
}

.htt-loading-overlay__circle-3
{
  left: calc(50% + 40px);
}

.htt-loading-overlay__circle-3::before
{
  animation-delay: 0.4s;
}

@keyframes htt-loading-overlay__circle-keyframes
{
  0%
  {
    transform: scale(1, 1);
  }

  20%
  {
    transform: scale(2, 2);
  }

  40%
  {
    transform: scale(1, 1);
  }

  100%
  {
    transform: scale(1, 1);
  }
}