CSS3实现莲花绽放的动画效果

<section class="demo">  
  <div class="box">  
     <div class="leaf"></div>  
     <div class="leaf"></div>  
     <div class="leaf"></div>  
     <div class="leaf"></div>  
     <div class="leaf"></div>  
     <div class="leaf"></div> 
     <div class="leaf"></div>  
     <div class="leaf"></div>  
     <div class="leaf"></div>  
  </div>  
</section>

View Code 
body {
   background-color: #000;
}      

.demo {
   margin:0px auto;
   width: 500px;
}
/*莲花花瓣的容器*/
.box {
   position: relative;/*设置相对定位，因为花瓣都要进行绝对定位*/   
   height: 400px;
   margin-top:400px
}
/*花瓣进行绝对定位*/
.box .leaf {
   position: absolute;
}
/*绘制莲花花瓣*/
.leaf {
   margin-top:0px;
   width: 200px;
   height: 200px;
   border-radius: 200px 0px;/*制作花瓣角*/
   background: -moz-linear-gradient(45deg,rgba(188,190,192,1) 8%,rgba(158,31,99,1) 30%,rgba(158,31,99,1) 100%);/*制作花瓣颜色*/
        background: -webkit-linear-gradient(45deg,rgba(188,190,192,1) 8%,rgba(158,31,99,1) 30%,rgba(158,31,99,1) 100%);/*制作花瓣颜色*/
   opacity: .6;
   filter:alpha(opacity=50);
   transform: rotate(135deg);/*花瓣旋转135deg*/
   transform-origin:  top right;/*重置花瓣旋转原点，这个很重要*/
}

@keyframes show-2 {
    0% {
     transform: rotate(135deg);
    }
    50% {
     transform: rotate(45deg);
    }
    100%{
     transform: rotate(135deg);
    }
}
@keyframes show-3 {
    0% {
     transform: rotate(135deg);
    }
    50% {
     transform: rotate(65deg);
    }
    100%{
     transform: rotate(135deg);
    }
}
@keyframes show-4 {
    0% {
     transform: rotate(135deg);
    }
    50% {
     transform: rotate(85deg);
    }
    100%{
     transform: rotate(135deg);
    }
}
@keyframes show-5 {
    0% {
     transform: rotate(135deg);
    }
    50% {
     transform: rotate(105deg);
    }
    100%{
     transform: rotate(135deg);
    }
}
@keyframes show-6 {
    0% {
     transform: rotate(135deg);
    }
    50% {
     transform: rotate(165deg);
    }
    100%{
     transform: rotate(135deg);
    }
}
@keyframes show-7 {
    0% {
     transform: rotate(135deg);
    }
    50% {
     transform: rotate(185deg);
    }
    100%{
     transform: rotate(135deg);
    }
}
@keyframes show-8 {
    0% {
     transform: rotate(135deg);
    }
    50% {
     transform: rotate(205deg);
    }
    100%{
     transform: rotate(135deg);
    }
}  

@keyframes show-9 {
    0% {
     transform: rotate(135deg);
    }
    50% {
     transform: rotate(225deg);
    }
    100%{
     transform: rotate(135deg);
    }
}  

.leaf:nth-child(1) {
 background: -moz-linear-gradient(45deg,rgba(250,250,250,1) 8%,rgba(158,31,99,1) 30%,rgba(158,31,99,1) 100%);/*制作花瓣颜色*/
}
.leaf:nth-child(2) {
  animation: show-2 6s ease-in-out infinite;
}
.leaf:nth-child(3) {
  animation: show-3 6s ease-in-out infinite;
}
.leaf:nth-child(4) {
  animation: show-4 6s ease-in-out infinite;
}
.leaf:nth-child(5) {
  animation: show-5 6s ease-in-out infinite;
}
.leaf:nth-child(6) {
  animation: show-6 6s ease-in-out infinite;
}
.leaf:nth-child(7) {
  animation: show-7 6s ease-in-out infinite;
}
.leaf:nth-child(8) {
  animation: show-8 6s ease-in-out infinite;
}
.leaf:nth-child(9) {
  animation: show-9 6s ease-in-out infinite;
}