.sk-fading-circle {
    margin: auto;
    width: 100px;
    height: 100px;
    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: #333;
    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; }
}