CSS だけで作るローディング画像 ⑤
= Type 17 =

/* :not(:required) hides this rule from IE9 and below */
.inner-circles-loader:not(:required) {
  -moz-transform: translate3d(0, 0, 0);
  -ms-transform: translate3d(0, 0, 0);
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  position: relative;
  display: inline-block;
  width: 50px;
  height: 50px;
  background: rgba(25, 165, 152, 0.5);
  border-radius: 50%;
  overflow: hidden;
  text-indent: -9999px;
  /* Hides inner circles outside base circle at safari */
  -webkit-mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUg
  AAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccll
  PAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC);
}
.inner-circles-loader:not(:required):before, .inner-circles-loader:not(:required):after {
  content: '';
  position: absolute;
  top: 0;
  display: inline-block;
  width: 50px;
  height: 50px;
  border-radius: 50%;
}
.inner-circles-loader:not(:required):before {
  -moz-animation: inner-circles-loader 3s infinite;
  -webkit-animation: inner-circles-loader 3s infinite;
  animation: inner-circles-loader 3s infinite;
  -moz-transform-origin: 0 50%;
  -ms-transform-origin: 0 50%;
  -webkit-transform-origin: 0 50%;
  transform-origin: 0 50%;
  left: 0;
  background: #c7efcf;
}
.inner-circles-loader:not(:required):after {
  -moz-animation: inner-circles-loader 3s 0.2s reverse infinite;
  -webkit-animation: inner-circles-loader 3s 0.2s reverse infinite;
  animation: inner-circles-loader 3s 0.2s reverse infinite;
  -moz-transform-origin: 100% 50%;
  -ms-transform-origin: 100% 50%;
  -webkit-transform-origin: 100% 50%;
  transform-origin: 100% 50%;
  right: 0;
  background: #eef5db;
}
@-moz-keyframes inner-circles-loader {
  0% {
    -moz-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  50% {
    -moz-transform: rotate(360deg);
    transform: rotate(360deg);
  }
  100% {
    -moz-transform: rotate(0deg);
    transform: rotate(0deg);
  }
}
@-webkit-keyframes inner-circles-loader {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  50% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
  100% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
}
@keyframes inner-circles-loader {
  0% {
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  50% {
    -moz-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
  100% {
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
}