SOURCE

<div class="sk-cube-grid">
  <div class="sk-cube sk-cube1"></div>
  <div class="sk-cube sk-cube2"></div>
  <div class="sk-cube sk-cube3"></div>
  <div class="sk-cube sk-cube4"></div>
  <div class="sk-cube sk-cube5"></div>
  <div class="sk-cube sk-cube6"></div>
  <div class="sk-cube sk-cube7"></div>
  <div class="sk-cube sk-cube8"></div>
  <div class="sk-cube sk-cube9"></div>
</div>

body {
  background-color: #d35400;
}

.sk-cube-grid {
  width: 40px;
  height: 40px;
  margin: 40px auto;
  /*
   * Spinner positions
   * 1 2 3
   * 4 5 6
   * 7 8 9
   */
}

.sk-cube-grid .sk-cube {
  width: 33.33%;
  height: 33.33%;
  background-color: #FFF;
  float: left;
  -webkit-animation: sk-cubeGridScaleDelay 1.3s infinite ease-in-out;
  animation: sk-cubeGridScaleDelay 1.3s infinite ease-in-out;
}

.sk-cube-grid .sk-cube1 {
  -webkit-animation-delay: 0.2s;
  animation-delay: 0.2s;
}

.sk-cube-grid .sk-cube2 {
  -webkit-animation-delay: 0.3s;
  animation-delay: 0.3s;
}

.sk-cube-grid .sk-cube3 {
  -webkit-animation-delay: 0.4s;
  animation-delay: 0.4s;
}

.sk-cube-grid .sk-cube4 {
  -webkit-animation-delay: 0.1s;
  animation-delay: 0.1s;
}

.sk-cube-grid .sk-cube5 {
  -webkit-animation-delay: 0.2s;
  animation-delay: 0.2s;
}

.sk-cube-grid .sk-cube6 {
  -webkit-animation-delay: 0.3s;
  animation-delay: 0.3s;
}

.sk-cube-grid .sk-cube7 {
  -webkit-animation-delay: 0.0s;
  animation-delay: 0.0s;
}

.sk-cube-grid .sk-cube8 {
  -webkit-animation-delay: 0.1s;
  animation-delay: 0.1s;
}

.sk-cube-grid .sk-cube9 {
  -webkit-animation-delay: 0.2s;
  animation-delay: 0.2s;
}

@-webkit-keyframes sk-cubeGridScaleDelay {
  0%,
  70%,
  100% {
    -webkit-transform: scale3D(1, 1, 1);
    transform: scale3D(1, 1, 1);
  }
  35% {
    -webkit-transform: scale3D(0, 0, 1);
    transform: scale3D(0, 0, 1);
  }
}

@keyframes sk-cubeGridScaleDelay {
  0%,
  70%,
  100% {
    -webkit-transform: scale3D(1, 1, 1);
    transform: scale3D(1, 1, 1);
  }
  35% {
    -webkit-transform: scale3D(0, 0, 1);
    transform: scale3D(0, 0, 1);
  }
}