preloader css

index.html

<section>
  <br />
  <br />
  <br />
  <div class="preloader-whirlpool">
    <div class="whirlpool"></div>
  </div>
</section>

preloader.css

/*=======Markup=====

<div class="preloader-whirlpool">
	<div class="whirlpool"></div>
</div>

 */

.preloader-whirlpool {
  position: relative;
  .whirlpool {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px solid rgb(204, 204, 204);
    border-left-color: rgb(0, 0, 0);
    border-radius: 974px;
    -o-border-radius: 974px;
    -ms-border-radius: 974px;
    -webkit-border-radius: 974px;
    -moz-border-radius: 974px;
    &::before, &::after {
      position: absolute;
      top: 50%;
      left: 50%;
      border: 1px solid rgb(204, 204, 204);
      border-left-color: rgb(0, 0, 0);
      border-radius: 974px;
      -o-border-radius: 974px;
      -ms-border-radius: 974px;
      -webkit-border-radius: 974px;
      -moz-border-radius: 974px;
    }
    margin: -24px 0 0 -24px;
    height: 49px;
    width: 49px;
    animation: cssload-rotate 1150ms linear infinite;
    -o-animation: cssload-rotate 1150ms linear infinite;
    -ms-animation: cssload-rotate 1150ms linear infinite;
    -webkit-animation: cssload-rotate 1150ms linear infinite;
    -moz-animation: cssload-rotate 1150ms linear infinite;
    &::before {
      content: "";
      margin: -22px 0 0 -22px;
      height: 43px;
      width: 43px;
      animation: cssload-rotate 1150ms linear infinite;
      -o-animation: cssload-rotate 1150ms linear infinite;
      -ms-animation: cssload-rotate 1150ms linear infinite;
      -webkit-animation: cssload-rotate 1150ms linear infinite;
      -moz-animation: cssload-rotate 1150ms linear infinite;
    }
    &::after {
      content: "";
      margin: -28px 0 0 -28px;
      height: 55px;
      width: 55px;
      animation: cssload-rotate 2300ms linear infinite;
      -o-animation: cssload-rotate 2300ms linear infinite;
      -ms-animation: cssload-rotate 2300ms linear infinite;
      -webkit-animation: cssload-rotate 2300ms linear infinite;
      -moz-animation: cssload-rotate 2300ms linear infinite;
    }
  }
}

@keyframes cssload-rotate {
  100% {
    transform: rotate(360deg);
  }
}


@-o-keyframes cssload-rotate {
  100% {
    -o-transform: rotate(360deg);
  }
}


@-ms-keyframes cssload-rotate {
  100% {
    -ms-transform: rotate(360deg);
  }
}


@-webkit-keyframes cssload-rotate {
  100% {
    -webkit-transform: rotate(360deg);
  }
}


@-moz-keyframes cssload-rotate {
  100% {
    -moz-transform: rotate(360deg);
  }
}