css3 流星特效

//html
<div class="stars-space">
	<div class="star star-a"></div>
	<div class="star star-b"></div>
	<div class="star star-c"></div>
	<div class="star star-d"></div>
	<div class="star star-e"></div>
	<div class="star star-f"></div>
	<div class="star star-g"></div>
	<div class="star star-h"></div>
</div>

//css
.stars-space {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}
.star {
  display: block;
  width: 1px;
  background: transparent;
  position: relative;
  opacity: 0;
  /*过渡动画*/
  animation: star-ani 2s linear infinite;
  -webkit-animation: star-ani 2s linear infinite;
  -moz-animation: star-ani 2s linear infinite;
}

.star:after {
  content: '';
  display: block;
  border-style: solid;
  border-width: 0 90px 5px 90px;
  border-color: transparent transparent transparent rgba(101, 143, 250, .8);
  box-shadow: 0 0 1px 0 rgba(255, 255, 255, .1);
  /*变形*/
  transform: rotate(-45deg) translate3d(1px, 3px, 0);
  -webkit-transform: rotate(-45deg) translate3d(1px, 3px, 0);
  -moz-transform: rotate(-45deg) translate3d(1px, 3px, 0);
  transform-origin: 0 100%;
  -webkit-transform-origin: 0 100%;
  -moz-transform-origin: 0 100%;
}
.star-a {
  top: -30px;
  left: 20%;
}

.star-b {
  top: 60px;
  left: 24%;
  animation-delay: 4s;
  -webkit-animation-delay: 4s;
  -moz-animation-delay: 4s;
}

.star-c {
  top: 40px;
  left: 60%;
  animation-duration: 3s;
  -webkit-animation-duration: 3s;
  -moz-animation-duration: 3s;
  animation-delay: 15s;
  -webkit-animation-delay: 1s;
  -moz-animation-delay: 5s;
}

.star-d {
  top: -30px;
  left: 108%;
  animation-delay: 2s;
  -webkit-animation-delay: 2s;
  -moz-animation-delay: 2s;
}

.star-e {
  top: 40px;
  left: 86%;
  animation-duration: 4s;
  -webkit-animation-duration: 4s;
  -moz-animation-duration: 4s;
  animation-delay: 1s;
  -webkit-animation-delay: 1s;
  -moz-animation-delay: 1s;
}

.star-f {
  top: -200px;
  left: 60%;
  animation-duration: 4s;
  -webkit-animation-duration: 4s;
  -moz-animation-duration: 4s;
}

.star-g {
  top: -150px;
  left: 110%;
  animation-duration: 3s;
  -webkit-animation-duration: 3s;
  -moz-animation-duration: 3s;
}

.star-h {
  top: -150px;
  left: 15%;
  animation-duration: 2.5s;
  -webkit-animation-duration: 2.5s;
  -moz-animation-duration: 2.5s;
}

@keyframes star-ani {
  0% {
      opacity: 0;
      transform: scale(0.5) translate3d(0, 0, 0);
      -webkit-transform: scale(0.5) translate3d(0, 0, 0);
      -moz-transform: scale(0.5) translate3d(0, 0, 0);
  }
  50% {
      opacity: 1;
      transform: translate3d(-200px, 200px, 0);
      -webkit-transform: translate3d(-200px, 200px, 0);
      -moz-transform: translate3d(-200px, 200px, 0);
  }
  100% {
      opacity: 0;
      transform: scale(1.2) translate3d(-300px, 300px, 0);
      -webkit-transform: scale(1.2) translate3d(-300px, 300px, 0);
      -moz-transform: scale(1.2) translate3d(-300px, 300px, 0);
  }
}
@-webkit-keyframes star-ani {
  0% {
      opacity: 0;
      transform: scale(0.5) translate3d(0, 0, 0);
      -webkit-transform: scale(0.5) translate3d(0, 0, 0);
      -moz-transform: scale(0.5) translate3d(0, 0, 0);
  }
  50% {
      opacity: 1;
      transform: translate3d(-200px, 200px, 0);
      -webkit-transform: translate3d(-200px, 200px, 0);
      -moz-transform: translate3d(-200px, 200px, 0);
  }
  100% {
      opacity: 0;
      transform: scale(1.2) translate3d(-300px, 300px, 0);
      -webkit-transform: scale(1.2) translate3d(-300px, 300px, 0);
      -moz-transform: scale(1.2) translate3d(-300px, 300px, 0);
  }
}
@-moz-keyframes star-ani {
  0% {
      opacity: 0;
      transform: scale(0.5) translate3d(0, 0, 0);
      -webkit-transform: scale(0.5) translate3d(0, 0, 0);
      -moz-transform: scale(0.5) translate3d(0, 0, 0);
  }
  50% {
      opacity: 1;
      transform: translate3d(-200px, 200px, 0);
      -webkit-transform: translate3d(-200px, 200px, 0);
      -moz-transform: translate3d(-200px, 200px, 0);
  }
  100% {
      opacity: 0;
      transform: scale(1.2) translate3d(-300px, 300px, 0);
      -webkit-transform: scale(1.2) translate3d(-300px, 300px, 0);
      -moz-transform: scale(1.2) translate3d(-300px, 300px, 0);
  }
}