你能相信吗？这些都是由一个DIV元素实现的动画，纯CSS3技术

<div class="loader">加载中...</div>

.loader,
.loader:before,
.loader:after {
  background: #FFF;
  -webkit-animation: load1 1s infinite ease-in-out;
  animation: load1 1s infinite ease-in-out;
  width: 1em;
  height: 4em;
}
.loader:before,
.loader:after {
  position: absolute;
  top: 0;
  content: '';
}
.loader:before {
  left: -1.5em;
}
.loader {
  text-indent: -9999em;
  margin: 40% auto;
  position: relative;
  font-size: 11px;
  -webkit-animation-delay: 0.16s;
  animation-delay: 0.16s;
}
.loader:after {
  left: 1.5em;
  -webkit-animation-delay: 0.32s;
  animation-delay: 0.32s;
}
@-webkit-keyframes load1 {
  0%,
  80%,
  100% {
    box-shadow: 0 0 #FFF;
    height: 4em;
  }
  40% {
    box-shadow: 0 -2em #ffffff;
    height: 5em;
  }
}
@keyframes load1 {
  0%,
  80%,
  100% {
    box-shadow: 0 0 #FFF;
    height: 4em;
  }
  40% {
    box-shadow: 0 -2em #ffffff;
    height: 5em;
  }
}

<div class="loader">加载中...</div>

.load2 .loader,
.load2 .loader:before,
.load2 .loader:after {
  border-radius: 50%;
}
.load2 .loader:before,
.load2 .loader:after {
  position: absolute;
  content: '';
}
.load2 .loader:before {
  width: 5.2em;
  height: 10.2em;
  background: #0dcecb;
  border-radius: 10.2em 0 0 10.2em;
  top: -0.1em;
  left: -0.1em;
  -webkit-transform-origin: 5.2em 5.1em;
  transform-origin: 5.2em 5.1em;
  -webkit-animation: load2 2s infinite ease 1.5s;
  animation: load2 2s infinite ease 1.5s;
}
.load2 .loader {
  font-size: 11px;
  text-indent: -99999em;
  margin: 30% auto;
  position: relative;
  width: 10em;
  height: 10em;
  box-shadow: inset 0 0 0 1em #FFF;
}
.load2 .loader:after {
  width: 5.2em;
  height: 10.2em;
  background: #0dcecb;
  border-radius: 0 10.2em 10.2em 0;
  top: -0.1em;
  left: 5.1em;
  -webkit-transform-origin: 0px 5.1em;
  transform-origin: 0px 5.1em;
  -webkit-animation: load2 2s infinite ease;
  animation: load2 2s infinite ease;
}
@-webkit-keyframes load2 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes load2 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

<div class="loader">加载中...</div>

.load3 .loader {
  font-size: 10px;
  margin: 30% auto;
  text-indent: -9999em;
  width: 11em;
  height: 11em;
  border-radius: 50%;
  background: #ffffff;
  background: -moz-linear-gradient(left, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  background: -webkit-linear-gradient(left, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  background: -o-linear-gradient(left, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  background: -ms-linear-gradient(left, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  background: linear-gradient(to right, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  position: relative;
  -webkit-animation: load3 1.4s infinite linear;
  animation: load3 1.4s infinite linear;
}
.load3 .loader:before {
  width: 50%;
  height: 50%;
  background: #FFF;
  border-radius: 100% 0 0 0;
  position: absolute;
  top: 0;
  left: 0;
  content: '';
}
.load3 .loader:after {
  background: #0dcecb;
  width: 75%;
  height: 75%;
  border-radius: 50%;
  content: '';
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}
@-webkit-keyframes load3 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes load3 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

<div class="loader">加载中...</div>

.load4
 .loader {
  font-size: 20px;
  margin: 45% auto;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  position: relative;
  text-indent: -9999em;
  -webkit-animation: load4 1.3s infinite linear;
  animation: load4 1.3s infinite linear;
}
@-webkit-keyframes load4 {
  0%,
  100% {
    box-shadow: 0em -3em 0em 0.2em #ffffff, 2em -2em 0 0em #ffffff, 3em 
0em 0 -0.5em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 -0.5em 
#ffffff, -2em 2em 0 -0.5em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em
 0 0em #ffffff;
  }
  12.5% {
    box-shadow: 0em -3em 0em 0em #ffffff, 2em -2em 0 0.2em #ffffff, 3em 
0em 0 0em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 -0.5em #ffffff, 
-2em 2em 0 -0.5em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em 0 -0.5em
 #ffffff;
  }
  25% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 0em #ffffff, 3em
 0em 0 0.2em #ffffff, 2em 2em 0 0em #ffffff, 0em 3em 0 -0.5em #ffffff, 
-2em 2em 0 -0.5em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em 0 -0.5em
 #ffffff;
  }
  37.5% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 -0.5em #ffffff, 
3em 0em 0 0em #ffffff, 2em 2em 0 0.2em #ffffff, 0em 3em 0 0em #ffffff, 
-2em 2em 0 -0.5em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em 0 -0.5em
 #ffffff;
  }
  50% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 -0.5em #ffffff, 
3em 0em 0 -0.5em #ffffff, 2em 2em 0 0em #ffffff, 0em 3em 0 0.2em 
#ffffff, -2em 2em 0 0em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em 0 
-0.5em #ffffff;
  }
  62.5% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 -0.5em #ffffff, 
3em 0em 0 -0.5em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 0em 
#ffffff, -2em 2em 0 0.2em #ffffff, -3em 0em 0 0em #ffffff, -2em -2em 0 
-0.5em #ffffff;
  }
  75% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 -0.5em #ffffff, 
3em 0em 0 -0.5em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 -0.5em 
#ffffff, -2em 2em 0 0em #ffffff, -3em 0em 0 0.2em #ffffff, -2em -2em 0 
0em #ffffff;
  }
  87.5% {
    box-shadow: 0em -3em 0em 0em #ffffff, 2em -2em 0 -0.5em #ffffff, 3em
 0em 0 -0.5em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 -0.5em 
#ffffff, -2em 2em 0 0em #ffffff, -3em 0em 0 0em #ffffff, -2em -2em 0 
0.2em #ffffff;
  }
}
@keyframes load4 {
  0%,
  100% {
    box-shadow: 0em -3em 0em 0.2em #ffffff, 2em -2em 0 0em #ffffff, 3em 
0em 0 -0.5em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 -0.5em 
#ffffff, -2em 2em 0 -0.5em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em
 0 0em #ffffff;
  }
  12.5% {
    box-shadow: 0em -3em 0em 0em #ffffff, 2em -2em 0 0.2em #ffffff, 3em 
0em 0 0em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 -0.5em #ffffff, 
-2em 2em 0 -0.5em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em 0 -0.5em
 #ffffff;
  }
  25% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 0em #ffffff, 3em
 0em 0 0.2em #ffffff, 2em 2em 0 0em #ffffff, 0em 3em 0 -0.5em #ffffff, 
-2em 2em 0 -0.5em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em 0 -0.5em
 #ffffff;
  }
  37.5% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 -0.5em #ffffff, 
3em 0em 0 0em #ffffff, 2em 2em 0 0.2em #ffffff, 0em 3em 0 0em #ffffff, 
-2em 2em 0 -0.5em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em 0 -0.5em
 #ffffff;
  }
  50% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 -0.5em #ffffff, 
3em 0em 0 -0.5em #ffffff, 2em 2em 0 0em #ffffff, 0em 3em 0 0.2em 
#ffffff, -2em 2em 0 0em #ffffff, -3em 0em 0 -0.5em #ffffff, -2em -2em 0 
-0.5em #ffffff;
  }
  62.5% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 -0.5em #ffffff, 
3em 0em 0 -0.5em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 0em 
#ffffff, -2em 2em 0 0.2em #ffffff, -3em 0em 0 0em #ffffff, -2em -2em 0 
-0.5em #ffffff;
  }
  75% {
    box-shadow: 0em -3em 0em -0.5em #ffffff, 2em -2em 0 -0.5em #ffffff, 
3em 0em 0 -0.5em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 -0.5em 
#ffffff, -2em 2em 0 0em #ffffff, -3em 0em 0 0.2em #ffffff, -2em -2em 0 
0em #ffffff;
  }
  87.5% {
    box-shadow: 0em -3em 0em 0em #ffffff, 2em -2em 0 -0.5em #ffffff, 3em
 0em 0 -0.5em #ffffff, 2em 2em 0 -0.5em #ffffff, 0em 3em 0 -0.5em 
#ffffff, -2em 2em 0 0em #ffffff, -3em 0em 0 0em #ffffff, -2em -2em 0 
0.2em #ffffff;
  }
}

<div class="loader">加载中...</div>

.load5
 .loader {
  margin: 46% auto;
  font-size: 25px;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  position: relative;
  text-indent: -9999em;
  -webkit-animation: load5 1.1s infinite ease;
  animation: load5 1.1s infinite ease;
}
@-webkit-keyframes load5 {
  0%,
  100% {
    box-shadow: 0em -2.6em 0em 0em #ffffff, 1.8em -1.8em 0 0em rgba(255,
 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 255, 0.2), 1.75em 1.75em
 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em rgba(255, 255, 255, 
0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), -2.6em 0em 0 0em 
rgba(255, 255, 255, 0.5), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.7);
  }
  12.5% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.7), 1.8em 
-1.8em 0 0em #ffffff, 2.5em 0em 0 0em rgba(255, 255, 255, 0.2), 1.75em 
1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em rgba(255, 255, 
255, 0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), -2.6em 0em 0 0em
 rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.5);
  }
  25% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.5), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.7), 2.5em 0em 0 0em #ffffff, 1.75em 
1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em rgba(255, 255, 
255, 0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), -2.6em 0em 0 0em
 rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.2);
  }
  37.5% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.5), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.7), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em
 rgba(255, 255, 255, 0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), 
-2.6em 0em 0 0em rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255,
 255, 255, 0.2);
  }
  50% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.5), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.7), 0em 2.5em 0 0em
 #ffffff, -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), -2.6em 0em 0 0em 
rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.2);
  }
  62.5% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.2), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.5), 0em 2.5em 0 0em
 rgba(255, 255, 255, 0.7), -1.8em 1.8em 0 0em #ffffff, -2.6em 0em 0 0em 
rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.2);
  }
  75% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.2), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em
 rgba(255, 255, 255, 0.5), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.7), 
-2.6em 0em 0 0em #ffffff, -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.2);
  }
  87.5% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.2), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em
 rgba(255, 255, 255, 0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.5), 
-2.6em 0em 0 0em rgba(255, 255, 255, 0.7), -1.8em -1.8em 0 0em #ffffff;
  }
}
@keyframes load5 {
  0%,
  100% {
    box-shadow: 0em -2.6em 0em 0em #ffffff, 1.8em -1.8em 0 0em rgba(255,
 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 255, 0.2), 1.75em 1.75em
 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em rgba(255, 255, 255, 
0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), -2.6em 0em 0 0em 
rgba(255, 255, 255, 0.5), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.7);
  }
  12.5% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.7), 1.8em 
-1.8em 0 0em #ffffff, 2.5em 0em 0 0em rgba(255, 255, 255, 0.2), 1.75em 
1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em rgba(255, 255, 
255, 0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), -2.6em 0em 0 0em
 rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.5);
  }
  25% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.5), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.7), 2.5em 0em 0 0em #ffffff, 1.75em 
1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em rgba(255, 255, 
255, 0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), -2.6em 0em 0 0em
 rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.2);
  }
  37.5% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.5), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.7), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em
 rgba(255, 255, 255, 0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), 
-2.6em 0em 0 0em rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255,
 255, 255, 0.2);
  }
  50% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.5), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.7), 0em 2.5em 0 0em
 #ffffff, -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.2), -2.6em 0em 0 0em 
rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.2);
  }
  62.5% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.2), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.5), 0em 2.5em 0 0em
 rgba(255, 255, 255, 0.7), -1.8em 1.8em 0 0em #ffffff, -2.6em 0em 0 0em 
rgba(255, 255, 255, 0.2), -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.2);
  }
  75% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.2), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em
 rgba(255, 255, 255, 0.5), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.7), 
-2.6em 0em 0 0em #ffffff, -1.8em -1.8em 0 0em rgba(255, 255, 255, 0.2);
  }
  87.5% {
    box-shadow: 0em -2.6em 0em 0em rgba(255, 255, 255, 0.2), 1.8em 
-1.8em 0 0em rgba(255, 255, 255, 0.2), 2.5em 0em 0 0em rgba(255, 255, 
255, 0.2), 1.75em 1.75em 0 0em rgba(255, 255, 255, 0.2), 0em 2.5em 0 0em
 rgba(255, 255, 255, 0.2), -1.8em 1.8em 0 0em rgba(255, 255, 255, 0.5), 
-2.6em 0em 0 0em rgba(255, 255, 255, 0.7), -1.8em -1.8em 0 0em #ffffff;
  }
}

<div class="loader">加载中...</div>

.loader
 {
  font-size: 90px;
  text-indent: -9999em;
  overflow: hidden;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  margin: 33% auto;
  position: relative;
  -webkit-animation: load6 1.7s infinite ease;
  animation: load6 1.7s infinite ease;
}
@-webkit-keyframes load6 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.11em -0.83em 0 
-0.42em #ffffff, -0.11em -0.83em 0 -0.44em #ffffff, -0.11em -0.83em 0 
-0.46em #ffffff, -0.11em -0.83em 0 -0.477em #ffffff;
  }
  5%,
  95% {
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.11em -0.83em 0 
-0.42em #ffffff, -0.11em -0.83em 0 -0.44em #ffffff, -0.11em -0.83em 0 
-0.46em #ffffff, -0.11em -0.83em 0 -0.477em #ffffff;
  }
  30% {
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.51em -0.66em 0 
-0.42em #ffffff, -0.75em -0.36em 0 -0.44em #ffffff, -0.83em -0.03em 0 
-0.46em #ffffff, -0.81em 0.21em 0 -0.477em #ffffff;
  }
  55% {
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.29em -0.78em 0 
-0.42em #ffffff, -0.43em -0.72em 0 -0.44em #ffffff, -0.52em -0.65em 0 
-0.46em #ffffff, -0.57em -0.61em 0 -0.477em #ffffff;
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.11em -0.83em 0 
-0.42em #ffffff, -0.11em -0.83em 0 -0.44em #ffffff, -0.11em -0.83em 0 
-0.46em #ffffff, -0.11em -0.83em 0 -0.477em #ffffff;
  }
}
@keyframes load6 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.11em -0.83em 0 
-0.42em #ffffff, -0.11em -0.83em 0 -0.44em #ffffff, -0.11em -0.83em 0 
-0.46em #ffffff, -0.11em -0.83em 0 -0.477em #ffffff;
  }
  5%,
  95% {
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.11em -0.83em 0 
-0.42em #ffffff, -0.11em -0.83em 0 -0.44em #ffffff, -0.11em -0.83em 0 
-0.46em #ffffff, -0.11em -0.83em 0 -0.477em #ffffff;
  }
  30% {
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.51em -0.66em 0 
-0.42em #ffffff, -0.75em -0.36em 0 -0.44em #ffffff, -0.83em -0.03em 0 
-0.46em #ffffff, -0.81em 0.21em 0 -0.477em #ffffff;
  }
  55% {
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.29em -0.78em 0 
-0.42em #ffffff, -0.43em -0.72em 0 -0.44em #ffffff, -0.52em -0.65em 0 
-0.46em #ffffff, -0.57em -0.61em 0 -0.477em #ffffff;
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
    box-shadow: -0.11em -0.83em 0 -0.4em #ffffff, -0.11em -0.83em 0 
-0.42em #ffffff, -0.11em -0.83em 0 -0.44em #ffffff, -0.11em -0.83em 0 
-0.46em #ffffff, -0.11em -0.83em 0 -0.477em #ffffff;
  }
}

<div class="loader">加载中...</div>

.load7 .loader:before,
.load7 .loader:after,
.load7 .loader {
  border-radius: 50%;
  width: 2.5em;
  height: 2.5em;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation: load7 1.8s infinite ease-in-out;
  animation: load7 1.8s infinite ease-in-out;
}
.load7 .loader {
  margin: 8em auto;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  -webkit-animation-delay: 0.16s;
  animation-delay: 0.16s;
}
.load7 .loader:before {
  left: -3.5em;
}
.load7 .loader:after {
  left: 3.5em;
  -webkit-animation-delay: 0.32s;
  animation-delay: 0.32s;
}
.load7 .loader:before,
.loader:after {
  content: '';
  position: absolute;
  top: 0;
}
@-webkit-keyframes load7 {
  0%,
  80%,
  100% {
    box-shadow: 0 2.5em 0 -1.3em #ffffff;
  }
  40% {
    box-shadow: 0 2.5em 0 0 #FFF;
  }
}
@keyframes load7 {
  0%,
  80%,
  100% {
    box-shadow: 0 2.5em 0 -1.3em #ffffff;
  }
  40% {
    box-shadow: 0 2.5em 0 0 #FFF;
  }
}

<div class="loader">加载中...</div>

.load8 .loader {
  margin: 6em auto;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border-top: 1.1em solid rgba(255, 255, 255, 0.2);
  border-right: 1.1em solid rgba(255, 255, 255, 0.2);
  border-bottom: 1.1em solid rgba(255, 255, 255, 0.2);
  border-left: 1.1em solid #ffffff;
  -webkit-animation: load8 1.1s infinite linear;
  animation: load8 1.1s infinite linear;
}
.load8 .loader,
.load8 .loader:after {
  border-radius: 50%;
  width: 10em;
  height: 10em;
}
@-webkit-keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}