CSS3全屏背景图片缩小渐变代码

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以下是 CSS3全屏背景图片缩小渐变代码的示例演示效果:
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部分效果截图:
HTML代码(index.html):
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS3全屏背景图片缩小渐变代码</title>
<!--<link rel="stylesheet prefetch" href="http://fonts.useso.com/css?family=Raleway:300">-->
<style type="text/css">
*{margin:0;padding:0;}

.slideshow {
  position: absolute;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.slideshow-image {
  position: absolute;
  width: 100%;
  height: 100%;
  background: no-repeat 50% 50%;
  background-size: cover;
  -webkit-animation-name: kenburns;
          animation-name: kenburns;
  -webkit-animation-timing-function: linear;
          animation-timing-function: linear;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
  -webkit-animation-duration: 16s;
          animation-duration: 16s;
  opacity: 1;
  -webkit-transform: scale(1.2);
          transform: scale(1.2);
}
.slideshow-image:nth-child(1) {
  -webkit-animation-name: kenburns-1;
          animation-name: kenburns-1;
  z-index: 3;
}
.slideshow-image:nth-child(2) {
  -webkit-animation-name: kenburns-2;
          animation-name: kenburns-2;
  z-index: 2;
}
.slideshow-image:nth-child(3) {
  -webkit-animation-name: kenburns-3;
          animation-name: kenburns-3;
  z-index: 1;
}
.slideshow-image:nth-child(4) {
  -webkit-animation-name: kenburns-4;
          animation-name: kenburns-4;
  z-index: 0;
}

@-webkit-keyframes kenburns-1 {
  0% {
    opacity: 1;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  1.5625% {
    opacity: 1;
  }
  23.4375% {
    opacity: 1;
  }
  26.5625% {
    opacity: 0;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  98.4375% {
    opacity: 0;
    -webkit-transform: scale(1.21176);
            transform: scale(1.21176);
  }
  100% {
    opacity: 1;
  }
}

@keyframes kenburns-1 {
  0% {
    opacity: 1;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  1.5625% {
    opacity: 1;
  }
  23.4375% {
    opacity: 1;
  }
  26.5625% {
    opacity: 0;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  98.4375% {
    opacity: 0;
    -webkit-transform: scale(1.21176);
            transform: scale(1.21176);
  }
  100% {
    opacity: 1;
  }
}
@-webkit-keyframes kenburns-2 {
  23.4375% {
    opacity: 1;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  26.5625% {
    opacity: 1;
  }
  48.4375% {
    opacity: 1;
  }
  51.5625% {
    opacity: 0;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
}
@keyframes kenburns-2 {
  23.4375% {
    opacity: 1;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  26.5625% {
    opacity: 1;
  }
  48.4375% {
    opacity: 1;
  }
  51.5625% {
    opacity: 0;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
}
@-webkit-keyframes kenburns-3 {
  48.4375% {
    opacity: 1;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  51.5625% {
    opacity: 1;
  }
  73.4375% {
    opacity: 1;
  }
  76.5625% {
    opacity: 0;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
}
@keyframes kenburns-3 {
  48.4375% {
    opacity: 1;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  51.5625% {
    opacity: 1;
  }
  73.4375% {
    opacity: 1;
  }
  76.5625% {
    opacity: 0;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
}
@-webkit-keyframes kenburns-4 {
  73.4375% {
    opacity: 1;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  76.5625% {
    opacity: 1;
  }
  98.4375% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
}
@keyframes kenburns-4 {
  73.4375% {
    opacity: 1;
    -webkit-transform: scale(1.2);
            transform: scale(1.2);
  }
  76.5625% {
    opacity: 1;
  }
  98.4375% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
}


h1 {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate3d(-50%, -50%, 0);
          transform: translate3d(-50%, -50%, 0);
  z-index: 99;
  text-align: center;
  font-family: Raleway, sans-serif;
  font-weight: 300;
  text-transform: uppercase;
  background-color: rgba(255, 255, 255, 0.75);
  box-shadow: 0 1em 2em -1em rgba(0, 0, 0, 0.5);
  padding: 1em 2em;
  line-height: 1.5;
}
h1 small {
  display: block;
  text-transform: lowercase;
  font-size: .7em;
}
h1 small:first-child {
  border-bottom: 1px solid rgba(0, 0, 0, 0.25);
  padding-bottom: .5em;
}
h1 small:last-child {
  border-top: 1px solid rgba(0, 0, 0, 0.25);
  padding-top: .5em;
}
</style>
</head>
<body>

<!-- 文字区不需要请连css部分代码一并删除 -->
<h1><small>全屏</small>自动切换背景</h1>

<!-- 你可以添加个多“.slideshow-image”项目, 记得修改CSS -->
<div class="slideshow">
	<div class="slideshow-image" style="background-image: url('img/1.jpg')"></div>
	<div class="slideshow-image" style="background-image: url('img/2.jpg')"></div>
	<div class="slideshow-image" style="background-image: url('img/3.jpg')"></div>
	<div class="slideshow-image" style="background-image: url('img/4.jpg')"></div>
</div>
</body>
</html>
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