SOURCE

<div class="sk-folding-cube">
        <div class="sk-cube1 sk-cube"></div>
        <div class="sk-cube2 sk-cube"></div>
        <div class="sk-cube4 sk-cube"></div>
        <div class="sk-cube3 sk-cube"></div>
      </div>

body{
  background-color: #d35400;
}
.sk-folding-cube {
  margin: 40px auto;
  width: 40px;
  height: 40px;
  position: relative;
  -webkit-transform: rotateZ(45deg);
          transform: rotateZ(45deg); }
  .sk-folding-cube .sk-cube {
    float: left;
    width: 50%;
    height: 50%;
    position: relative;
    -webkit-transform: scale(1.1);
        -ms-transform: scale(1.1);
            transform: scale(1.1); }
  .sk-folding-cube .sk-cube:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #FFF;
    -webkit-animation: sk-foldCubeAngle 2.4s infinite linear both;
            animation: sk-foldCubeAngle 2.4s infinite linear both;
    -webkit-transform-origin: 100% 100%;
        -ms-transform-origin: 100% 100%;
            transform-origin: 100% 100%; }
  .sk-folding-cube .sk-cube2 {
    -webkit-transform: scale(1.1) rotateZ(90deg);
            transform: scale(1.1) rotateZ(90deg); }
  .sk-folding-cube .sk-cube3 {
    -webkit-transform: scale(1.1) rotateZ(180deg);
            transform: scale(1.1) rotateZ(180deg); }
  .sk-folding-cube .sk-cube4 {
    -webkit-transform: scale(1.1) rotateZ(270deg);
            transform: scale(1.1) rotateZ(270deg); }
  .sk-folding-cube .sk-cube2:before {
    -webkit-animation-delay: 0.3s;
            animation-delay: 0.3s; }
  .sk-folding-cube .sk-cube3:before {
    -webkit-animation-delay: 0.6s;
            animation-delay: 0.6s; }
  .sk-folding-cube .sk-cube4:before {
    -webkit-animation-delay: 0.9s;
            animation-delay: 0.9s; }

@-webkit-keyframes sk-foldCubeAngle {
  0%, 10% {
    -webkit-transform: perspective(140px) rotateX(-180deg);
            transform: perspective(140px) rotateX(-180deg);
    opacity: 0; }
  25%, 75% {
    -webkit-transform: perspective(140px) rotateX(0deg);
            transform: perspective(140px) rotateX(0deg);
    opacity: 1; }
  90%, 100% {
    -webkit-transform: perspective(140px) rotateY(180deg);
            transform: perspective(140px) rotateY(180deg);
    opacity: 0; } }

@keyframes sk-foldCubeAngle {
  0%, 10% {
    -webkit-transform: perspective(140px) rotateX(-180deg);
            transform: perspective(140px) rotateX(-180deg);
    opacity: 0; }
  25%, 75% {
    -webkit-transform: perspective(140px) rotateX(0deg);
            transform: perspective(140px) rotateX(0deg);
    opacity: 1; }
  90%, 100% {
    -webkit-transform: perspective(140px) rotateY(180deg);
            transform: perspective(140px) rotateY(180deg);
    opacity: 0; } }