@-webkit-keyframes clockwise {
  0% {
    -webkit-transform: rotate(-45deg);
  }
  100% {
    -webkit-transform: rotate(315deg);
  }
}
@-moz-keyframes clockwise {
  0% {
    -moz-transform: rotate(-45deg);
  }
  100% {
    -moz-transform: rotate(315deg);
  }
}
@keyframes clockwise {
  0% {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
  }
  100% {
    -webkit-transform: rotate(315deg);
    -moz-transform: rotate(315deg);
    -ms-transform: rotate(315deg);
    -o-transform: rotate(315deg);
    transform: rotate(315deg);
  }
}
@-webkit-keyframes not-clockwise {
  0% {
    -webkit-transform: rotate(45deg);
  }
  100% {
    -webkit-transform: rotate(-315deg);
  }
}
@-moz-keyframes not-clockwise {
  0% {
    -moz-transform: rotate(45deg);
  }
  100% {
    -moz-transform: rotate(-315deg);
  }
}
@keyframes not-clockwise {
  0% {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
  }
  100% {
    -webkit-transform: rotate(-315deg);
    -moz-transform: rotate(-315deg);
    -ms-transform: rotate(-315deg);
    -o-transform: rotate(-315deg);
    transform: rotate(-315deg);
  }
}
@-webkit-keyframes lt {
  0% {
    opacity: 1;
  }
  25% {
    opacity: 1;
  }
  26% {
    opacity: 0;
  }
  75% {
    opacity: 0;
  }
  76% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@-moz-keyframes lt {
  0% {
    opacity: 1;
  }
  25% {
    opacity: 1;
  }
  26% {
    opacity: 0;
  }
  75% {
    opacity: 0;
  }
  76% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes lt {
  0% {
    opacity: 1;
  }
  25% {
    opacity: 1;
  }
  26% {
    opacity: 0;
  }
  75% {
    opacity: 0;
  }
  76% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
.container {
  width: 74px;
  margin: 60px auto;
  font-size: 0;
  position: relative;
  -webkit-transform-origin: 50% 50%;
  -moz-transform-origin: 50% 50%;
  -ms-transform-origin: 50% 50%;
  -o-transform-origin: 50% 50%;
  transform-origin: 50% 50%;
}
.container:before {
  position: absolute;
  content: '';
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  border: 6px solid #e5e5e5;
  border-radius: 100%;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
.container:after {
  position: absolute;
  content: '';
  z-index: -1;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  border: 6px solid #e5e5e5;
  border-radius: 100%;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.box, .lt, .rt, .lb, .rb {
  position: relative;
  display: inline-block;
  overflow: hidden;
  width: 40px;
  height: 20px;
  opacity: 1;
}
.box:before, .lt:before, .rt:before, .lb:before, .rb:before {
  position: absolute;
  content: '';
  width: 40px;
  height: 40px;
  border-top: 6px solid #C74066;
  border-right: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 6px solid transparent;
  border-radius: 100%;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.lt {
  margin-right: -6px;
  -webkit-animation: lt 2s linear -2000ms infinite;
  -moz-animation: lt 2s linear -2000ms infinite;
  animation: lt 2s linear -2000ms infinite;
}
.lt:before {
  top: 0;
  left: 0;
  -webkit-animation: not-clockwise 1s linear infinite;
  -moz-animation: not-clockwise 1s linear infinite;
  animation: not-clockwise 1s linear infinite;
}

.rt {
  -webkit-animation: lt 2s linear -1000ms infinite;
  -moz-animation: lt 2s linear -1000ms infinite;
  animation: lt 2s linear -1000ms infinite;
}
.rt:before {
  top: 0;
  right: 0;
  -webkit-animation: clockwise 1s linear infinite;
  -moz-animation: clockwise 1s linear infinite;
  animation: clockwise 1s linear infinite;
}

.lb {
  margin-right: -6px;
  -webkit-animation: lt 2s linear -1500ms infinite;
  -moz-animation: lt 2s linear -1500ms infinite;
  animation: lt 2s linear -1500ms infinite;
}
.lb:before {
  bottom: 0;
  left: 0;
  -webkit-animation: not-clockwise 1s linear infinite;
  -moz-animation: not-clockwise 1s linear infinite;
  animation: not-clockwise 1s linear infinite;
}

.rb {
  -webkit-animation: lt 2s linear -500ms infinite;
  -moz-animation: lt 2s linear -500ms infinite;
  animation: lt 2s linear -500ms infinite;
}
.rb:before {
  bottom: 0;
  right: 0;
  -webkit-animation: clockwise 1s linear infinite;
  -moz-animation: clockwise 1s linear infinite;
  animation: clockwise 1s linear infinite;
}

label {
  margin: 1em 0 1em .5em;
  font-size: .8em;
  cursor: pointer;
}

input[type="checkbox"]#spin {
  cursor: pointer;
  margin: 1em 0 1em 1em;
}
input[type="checkbox"]#spin:checked ~ .container {
  -webkit-animation: clockwise 6s linear infinite;
  -moz-animation: clockwise 6s linear infinite;
  animation: clockwise 6s linear infinite;
}