.sk-circle {
  margin: auto;
  width: 50px;
  height: 50px;
  position: relative;
}
.sk-circle .sk-child {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
}
.sk-circle .sk-child:before {
  content: '';
  display: block;
  margin: 0 auto;
  width: 15%;
  height: 15%;
  background-color: orangered;
  border-radius: 100%;
  -webkit-animation: sk-circleBounceDelay 1.2s infinite ease-in-out both;
          animation: sk-circleBounceDelay 1.2s infinite ease-in-out both;
}
.sk-circle .sk-circle2 {
  -webkit-transform: rotate(30deg);
      -ms-transform: rotate(30deg);
          transform: rotate(30deg); }
.sk-circle .sk-circle3 {
  -webkit-transform: rotate(60deg);
      -ms-transform: rotate(60deg);
          transform: rotate(60deg); }
.sk-circle .sk-circle4 {
  -webkit-transform: rotate(90deg);
      -ms-transform: rotate(90deg);
          transform: rotate(90deg); }
.sk-circle .sk-circle5 {
  -webkit-transform: rotate(120deg);
      -ms-transform: rotate(120deg);
          transform: rotate(120deg); }
.sk-circle .sk-circle6 {
  -webkit-transform: rotate(150deg);
      -ms-transform: rotate(150deg);
          transform: rotate(150deg); }
.sk-circle .sk-circle7 {
  -webkit-transform: rotate(180deg);
      -ms-transform: rotate(180deg);
          transform: rotate(180deg); }
.sk-circle .sk-circle8 {
  -webkit-transform: rotate(210deg);
      -ms-transform: rotate(210deg);
          transform: rotate(210deg); }
.sk-circle .sk-circle9 {
  -webkit-transform: rotate(240deg);
      -ms-transform: rotate(240deg);
          transform: rotate(240deg); }
.sk-circle .sk-circle10 {
  -webkit-transform: rotate(270deg);
      -ms-transform: rotate(270deg);
          transform: rotate(270deg); }
.sk-circle .sk-circle11 {
  -webkit-transform: rotate(300deg);
      -ms-transform: rotate(300deg);
          transform: rotate(300deg); }
.sk-circle .sk-circle12 {
  -webkit-transform: rotate(330deg);
      -ms-transform: rotate(330deg);
          transform: rotate(330deg); }
.sk-circle .sk-circle2:before {
  -webkit-animation-delay: -1.1s;
          animation-delay: -1.1s; }
.sk-circle .sk-circle3:before {
  -webkit-animation-delay: -1s;
          animation-delay: -1s; }
.sk-circle .sk-circle4:before {
  -webkit-animation-delay: -0.9s;
          animation-delay: -0.9s; }
.sk-circle .sk-circle5:before {
  -webkit-animation-delay: -0.8s;
          animation-delay: -0.8s; }
.sk-circle .sk-circle6:before {
  -webkit-animation-delay: -0.7s;
          animation-delay: -0.7s; }
.sk-circle .sk-circle7:before {
  -webkit-animation-delay: -0.6s;
          animation-delay: -0.6s; }
.sk-circle .sk-circle8:before {
  -webkit-animation-delay: -0.5s;
          animation-delay: -0.5s; }
.sk-circle .sk-circle9:before {
  -webkit-animation-delay: -0.4s;
          animation-delay: -0.4s; }
.sk-circle .sk-circle10:before {
  -webkit-animation-delay: -0.3s;
          animation-delay: -0.3s; }
.sk-circle .sk-circle11:before {
  -webkit-animation-delay: -0.2s;
          animation-delay: -0.2s; }
.sk-circle .sk-circle12:before {
  -webkit-animation-delay: -0.1s;
          animation-delay: -0.1s; }

@-webkit-keyframes sk-circleBounceDelay {
  0%, 80%, 100% {
    -webkit-transform: scale(0);
            transform: scale(0);
  } 40% {
    -webkit-transform: scale(1);
            transform: scale(1);
  }
}

@keyframes sk-circleBounceDelay {
  0%, 80%, 100% {
    -webkit-transform: scale(0);
            transform: scale(0);
  } 40% {
    -webkit-transform: scale(1);
            transform: scale(1);
  }
}

/*---------------------------------------------SEGUNDO EXEMPLO---------------------------------------------*/

.holder {
  position: absolute;
  left: 0px;
  top: 0px;
  bottom: 0px;
  right: 0px;
  width: 100%;
  height: 100%;
  /*background-color: #2d2f48;*/
}

.preloader {
  /* size */
  width: 100px;
  height: 100px;
  /*position: absolute;*/
  left: 50%;
  top: 50%;
  transform: translateX(-50%) translateY(-50%);
  animation: rotatePreloader 2s infinite ease-in;
}

@keyframes rotatePreloader {
  0% {
    transform: translateX(-50%) translateY(-50%) rotateZ(0deg);
  }
  100% {
    transform: translateX(-50%) translateY(-50%) rotateZ(-360deg);
  }
}
.preloader div {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
}

.preloader div:before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0%;
  width: 10%;
  height: 10%;
  background-color: #ffffff;
  transform: translateX(-50%);
  border-radius: 50%;
}

.preloader div:nth-child(1) {
  transform: rotateZ(0deg);
  animation: rotateCircle1 2s infinite linear;
  z-index: 9;
}

@keyframes rotateCircle1 {
  0% {
    opacity: 0;
  }
  0% {
    opacity: 1;
    transform: rotateZ(36deg);
  }
  7% {
    transform: rotateZ(0deg);
  }
  57% {
    transform: rotateZ(0deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(2) {
  transform: rotateZ(36deg);
  animation: rotateCircle2 2s infinite linear;
  z-index: 8;
}

@keyframes rotateCircle2 {
  5% {
    opacity: 0;
  }
  5.0001% {
    opacity: 1;
    transform: rotateZ(0deg);
  }
  12% {
    transform: rotateZ(-36deg);
  }
  62% {
    transform: rotateZ(-36deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(3) {
  transform: rotateZ(72deg);
  animation: rotateCircle3 2s infinite linear;
  z-index: 7;
}

@keyframes rotateCircle3 {
  10% {
    opacity: 0;
  }
  10.0002% {
    opacity: 1;
    transform: rotateZ(-36deg);
  }
  17% {
    transform: rotateZ(-72deg);
  }
  67% {
    transform: rotateZ(-72deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(4) {
  transform: rotateZ(108deg);
  animation: rotateCircle4 2s infinite linear;
  z-index: 6;
}

@keyframes rotateCircle4 {
  15% {
    opacity: 0;
  }
  15.0003% {
    opacity: 1;
    transform: rotateZ(-72deg);
  }
  22% {
    transform: rotateZ(-108deg);
  }
  72% {
    transform: rotateZ(-108deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(5) {
  transform: rotateZ(144deg);
  animation: rotateCircle5 2s infinite linear;
  z-index: 5;
}

@keyframes rotateCircle5 {
  20% {
    opacity: 0;
  }
  20.0004% {
    opacity: 1;
    transform: rotateZ(-108deg);
  }
  27% {
    transform: rotateZ(-144deg);
  }
  77% {
    transform: rotateZ(-144deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(6) {
  transform: rotateZ(180deg);
  animation: rotateCircle6 2s infinite linear;
  z-index: 4;
}

@keyframes rotateCircle6 {
  25% {
    opacity: 0;
  }
  25.0005% {
    opacity: 1;
    transform: rotateZ(-144deg);
  }
  32% {
    transform: rotateZ(-180deg);
  }
  82% {
    transform: rotateZ(-180deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(7) {
  transform: rotateZ(216deg);
  animation: rotateCircle7 2s infinite linear;
  z-index: 3;
}

@keyframes rotateCircle7 {
  30% {
    opacity: 0;
  }
  30.0006% {
    opacity: 1;
    transform: rotateZ(-180deg);
  }
  37% {
    transform: rotateZ(-216deg);
  }
  87% {
    transform: rotateZ(-216deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(8) {
  transform: rotateZ(252deg);
  animation: rotateCircle8 2s infinite linear;
  z-index: 2;
}

@keyframes rotateCircle8 {
  35% {
    opacity: 0;
  }
  35.0007% {
    opacity: 1;
    transform: rotateZ(-216deg);
  }
  42% {
    transform: rotateZ(-252deg);
  }
  92% {
    transform: rotateZ(-252deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(9) {
  transform: rotateZ(288deg);
  animation: rotateCircle9 2s infinite linear;
  z-index: 1;
}

@keyframes rotateCircle9 {
  40% {
    opacity: 0;
  }
  40.0008% {
    opacity: 1;
    transform: rotateZ(-252deg);
  }
  47% {
    transform: rotateZ(-288deg);
  }
  97% {
    transform: rotateZ(-288deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}
.preloader div:nth-child(10) {
  transform: rotateZ(324deg);
  animation: rotateCircle10 2s infinite linear;
  z-index: 0;
}

@keyframes rotateCircle10 {
  45% {
    opacity: 0;
  }
  45.0009% {
    opacity: 1;
    transform: rotateZ(-288deg);
  }
  52% {
    transform: rotateZ(-324deg);
  }
  102% {
    transform: rotateZ(-324deg);
  }
  100% {
    transform: rotateZ(-324deg);
    opacity: 1;
  }
}