.spinner {
  margin: 0 auto;
  width: 50px;
  height: 40px;
  text-align: center;
  font-size: 10px;
  position: absolute;
  top: calc(50% - 20px);
  left: calc(50% - 25px);
}

.spinner>div {
  background-color: #fff;
  height: 100%;
  width: 6px;
  display: inline-block;
  -webkit-animation: sk-stretchdelay 1.2s infinite ease-in-out;
  animation: sk-stretchdelay 1.2s infinite ease-in-out;
}

.spinner .rect2 {
  -webkit-animation-delay: -1.1s;
  animation-delay: -1.1s;
}

.spinner .rect3 {
  -webkit-animation-delay: -1.0s;
  animation-delay: -1.0s;
}

.spinner .rect4 {
  -webkit-animation-delay: -0.9s;
  animation-delay: -0.9s;
}

.spinner .rect5 {
  -webkit-animation-delay: -0.8s;
  animation-delay: -0.8s;
}

@-webkit-keyframes sk-stretchdelay {
  0%,
  40%,
  100% {
    -webkit-transform: scaleY(0.4)
  }
  20% {
    -webkit-transform: scaleY(1.0)
  }
}

@keyframes sk-stretchdelay {
  0%,
  40%,
  100% {
    transform: scaleY(0.4);
    -webkit-transform: scaleY(0.4);
  }
  20% {
    transform: scaleY(1.0);
    -webkit-transform: scaleY(1.0);
  }
}