.spanner {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  display: block;
  text-align: center;
  height: 300px;
  color: #fff;
  transform: translateY(-50%);
  z-index: 1000;
  visibility: hidden;
}

.overlay {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: 1;
  background: rgba(0, 0, 0, 0.5);
  visibility: hidden;
}

.loader,
.loader:before,
.loader:after {
  border-radius: 50%;
  width: 2.5em;
  height: 2.5em;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation: load7 1.8s infinite ease-in-out;
  animation: load7 1.8s infinite ease-in-out;
}

.loader {
  color: #ffffff;
  font-size: 10px;
  margin: 80px auto;
  position: relative;
  text-indent: -9999em;
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-animation-delay: -0.16s;
  animation-delay: -0.16s;
}

.loader:before,
.loader:after {
  content: '';
  position: absolute;
  top: 0;
}

.loader:before {
  left: -3.5em;
  -webkit-animation-delay: -0.32s;
  animation-delay: -0.32s;
}

.loader:after {
  left: 3.5em;
}

@-webkit-keyframes load7 {
  0%,
  80%,
  100% {
    box-shadow: 0 2.5em 0 -1.3em;
  }

  40% {
    box-shadow: 0 2.5em 0 0;
  }
}

@keyframes load7 {
  0%,
  80%,
  100% {
    box-shadow: 0 2.5em 0 -1.3em;
  }

  40% {
    box-shadow: 0 2.5em 0 0;
  }
}

.show {
  visibility: visible;
}

.spanner,
.overlay {
  opacity: 0;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

.spanner.show,
.overlay.show {
  opacity: 1;
}