.sk-fading-circle {
  margin: 50px auto;
  width: 150px;
  height: 150px;
  position: relative;
}

.sk-fading-circle .sk-circle {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
}

.sk-fading-circle .sk-circle:before {
  content: '';
  display: block;
  margin: 0 auto;
  width: 15%;
  height: 15%;
  background-color: #337ab7;
  border-radius: 100%;
  -webkit-animation: sk-circleFadeDelay 1.2s infinite ease-in-out both;
          animation: sk-circleFadeDelay 1.2s infinite ease-in-out both;
}
.sk-fading-circle .sk-circle2 {
  -webkit-transform: rotate(30deg);
      -ms-transform: rotate(30deg);
          transform: rotate(30deg);
}
.sk-fading-circle .sk-circle3 {
  -webkit-transform: rotate(60deg);
      -ms-transform: rotate(60deg);
          transform: rotate(60deg);
}
.sk-fading-circle .sk-circle4 {
  -webkit-transform: rotate(90deg);
      -ms-transform: rotate(90deg);
          transform: rotate(90deg);
}
.sk-fading-circle .sk-circle5 {
  -webkit-transform: rotate(120deg);
      -ms-transform: rotate(120deg);
          transform: rotate(120deg);
}
.sk-fading-circle .sk-circle6 {
  -webkit-transform: rotate(150deg);
      -ms-transform: rotate(150deg);
          transform: rotate(150deg);
}
.sk-fading-circle .sk-circle7 {
  -webkit-transform: rotate(180deg);
      -ms-transform: rotate(180deg);
          transform: rotate(180deg);
}
.sk-fading-circle .sk-circle8 {
  -webkit-transform: rotate(210deg);
      -ms-transform: rotate(210deg);
          transform: rotate(210deg);
}
.sk-fading-circle .sk-circle9 {
  -webkit-transform: rotate(240deg);
      -ms-transform: rotate(240deg);
          transform: rotate(240deg);
}
.sk-fading-circle .sk-circle10 {
  -webkit-transform: rotate(270deg);
      -ms-transform: rotate(270deg);
          transform: rotate(270deg);
}
.sk-fading-circle .sk-circle11 {
  -webkit-transform: rotate(300deg);
      -ms-transform: rotate(300deg);
          transform: rotate(300deg); 
}
.sk-fading-circle .sk-circle12 {
  -webkit-transform: rotate(330deg);
      -ms-transform: rotate(330deg);
          transform: rotate(330deg); 
}
.sk-fading-circle .sk-circle2:before {
  -webkit-animation-delay: -1.1s;
          animation-delay: -1.1s; 
}
.sk-fading-circle .sk-circle3:before {
  -webkit-animation-delay: -1s;
          animation-delay: -1s; 
}
.sk-fading-circle .sk-circle4:before {
  -webkit-animation-delay: -0.9s;
          animation-delay: -0.9s; 
}
.sk-fading-circle .sk-circle5:before {
  -webkit-animation-delay: -0.8s;
          animation-delay: -0.8s; 
}
.sk-fading-circle .sk-circle6:before {
  -webkit-animation-delay: -0.7s;
          animation-delay: -0.7s; 
}
.sk-fading-circle .sk-circle7:before {
  -webkit-animation-delay: -0.6s;
          animation-delay: -0.6s; 
}
.sk-fading-circle .sk-circle8:before {
  -webkit-animation-delay: -0.5s;
          animation-delay: -0.5s; 
}
.sk-fading-circle .sk-circle9:before {
  -webkit-animation-delay: -0.4s;
          animation-delay: -0.4s;
}
.sk-fading-circle .sk-circle10:before {
  -webkit-animation-delay: -0.3s;
          animation-delay: -0.3s;
}
.sk-fading-circle .sk-circle11:before {
  -webkit-animation-delay: -0.2s;
          animation-delay: -0.2s;
}
.sk-fading-circle .sk-circle12:before {
  -webkit-animation-delay: -0.1s;
          animation-delay: -0.1s;
}

@-webkit-keyframes sk-circleFadeDelay {
  0%, 39%, 100% { opacity: 0; }
  40% { opacity: 1; }
}

@keyframes sk-circleFadeDelay {
  0%, 39%, 100% { opacity: 0; }
  40% { opacity: 1; } 
}

.loading {
  font: 52px/1.5 Monospace;
  color: #337ab7;
  -webkit-perspective: 100px;
          perspective: 100px;
}
.loading > span {
  -webkit-animation: flip 4s infinite;
          animation: flip 4s infinite;
  display: inline-block;
  -webkit-transform-origin: 50% 50% -10px;
          transform-origin: 50% 50% -10px;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
}
.loading > span:nth-child(1) {
  -webkit-animation-delay: 0.1s;
          animation-delay: 0.1s;
}
.loading > span:nth-child(2) {
  -webkit-animation-delay: 0.2s;
          animation-delay: 0.2s;
}
.loading > span:nth-child(3) {
  -webkit-animation-delay: 0.3s;
          animation-delay: 0.3s;
}
.loading > span:nth-child(4) {
  -webkit-animation-delay: 0.4s;
          animation-delay: 0.4s;
}
.loading > span:nth-child(5) {
  -webkit-animation-delay: 0.5s;
          animation-delay: 0.5s;
}
.loading > span:nth-child(6) {
  -webkit-animation-delay: 0.6s;
          animation-delay: 0.6s;
}
.loading > span:nth-child(7) {
  -webkit-animation-delay: 0.7s;
          animation-delay: 0.7s;
}
.loading > span:nth-child(8) {
  -webkit-animation-delay: 0.8s;
          animation-delay: 0.8s;
}
.loading > span:nth-child(9) {
  -webkit-animation-delay: 0.9s;
          animation-delay: 0.9s;
}
.loading > span:nth-child(10) {
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.loading > span:nth-child(11) {
  -webkit-animation-delay: 1.1s;
          animation-delay: 1.1s;
}

@-webkit-keyframes flip {
  to {
    -webkit-transform: rotateX(1turn);
            transform: rotateX(1turn);
  }
}

@keyframes flip {
  to {
    -webkit-transform: rotateX(1turn);
            transform: rotateX(1turn);
  }
}
