纯css3实现的动画加载特效

  <div class="wrap">
        <div class="curve3">
        </div>
        <div class="curve2">
            <div class="text">
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            </div>
        </div>
        <div class="curve">
            <div class="topleft">
            </div>
            <div class="bottomright">
            </div>
        </div>
        <div class="bottomleft glow">
        </div>
        <div class="topright">
        </div>
    </div>

body {
   background: #252527;
}

.wrap {
  width:200px;
  margin-left:auto;
  margin-right:auto;
  position:relative;
}

.curve {
  left:200px;
  width:200px;
  height:200px;
  border-radius:100px;
  background: #252527;
  -webkit-animation: spin 1.5s;
   -webkit-animation-iteration-count: infinite;
  -webkit-animation-timing-function: linear;
   -moz-animation: spin 1.5s;
   -moz-animation-iteration-count: infinite;
  -moz-animation-timing-function: linear;
  animation: spin 1.5s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}

@-webkit-keyframes spin {
  0% {
    -webkit-transform: rotate(0deg);}
  100% {-webkit-transform: rotate(360deg);}
}

@-moz-keyframes spin {
  0% {
    -moz-transform: rotate(0deg);}
  100% {-moz-transform: rotate(360deg);}
}

@keyframes spin {
  0% {
    -moz-transform: rotate(0deg);}
  100% {-moz-transform: rotate(360deg);}
}

.curve3 {
  position:absolute;
  margin-top:149px;
  width:200px;
  height:200px;
  border-radius:100px;
  box-shadow: 0px 3px 5px 0.02em #888888;

}

.glow {
  box-shadow: 0px 3px 15px 0.02em #888888
}

.topleft {
  width:100px;
  height:100px;
  border-top-left-radius:100px;
  background:-webkit-linear-gradient(top right, #AAAAB3 10%, #252527 80%);
  background:-moz-linear-gradient(top right, #AAAAB3 10%, #252527 80%);
  background:linear-gradient(to bottom left, #AAAAB3 10%, #252527 80%);
}

.bottomright {
  width:100px;
  height:100px;
  border-bottom-right-radius:100px;
 background:-webkit-linear-gradient( top right, #252527 20%, #AAAAB3 90%);
  background:-moz-linear-gradient( top right, #252527 20%, #AAAAB3 90%);
  background:linear-gradient( to bottom left, #252527 20%, #AAAAB3 90%);
  position:relative;
  left:100px;
}

.curve2 {
  top:175px;
  left:25px;
  position:relative;
  width:150px;
  height:150px;
  border-radius:100px;
background-color:#252527;
  z-index:2;
  box-shadow: 0px 0px 5px 0.02em #888888;
}

.text {
  display:inline-block;
  font-family: ‘Oswald‘;
  font-size:80px;
  margin-left: 40px;
  margin-top: 16px;
  background:-webkit-linear-gradient( top left, white, #ffd700, #998100 80%);
  -webkit-background-clip:text;
  -webkit-text-fill-color: transparent;
  color:#ffd700;
}


.bottomleft {
  width:50px;
  height:50px;
  margin-right:;
  border-bottom-left-radius:50px;
  background:#252527;
  position:relative;
  z-index:-4;
  top:-100px;
}

.glow {
  box-shadow: 16px 30px 30px 5px #ffffff;
}


.topright {
  width:50px;
  height:50px;
  border-top-right-radius:50px;
  background:#252527;
  position:relative;
  left:125px;
  bottom:220px; 
  box-shadow: 5px -5px 35px 5px #ffffff;   z-index:-4;
}