用伪类添加翘边阴影：：before和：：after

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代码如下：

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>before、after</title>
<style>
.box h3{
text-align:center;
position:relative;
top:80px;
}
.box {
width:70%;
height:200px;
background:#FFF;
margin:40px auto;
}

.effect{
position:relative;
-webkit-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
-moz-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}
.effect::before, .effect::after{
content:""; //这里的内容为空
position:absolute;
z-index:-1;
-webkit-box-shadow:0 0 20px rgba(0,0,0,0.8);
-moz-box-shadow:0 0 20px rgba(0,0,0,0.8);
box-shadow:0 0 20px rgba(0,0,0,0.8);
top:50%;
bottom:0;
left:10px;
right:10px;
-moz-border-radius:100px / 10px;
border-radius:100px / 10px;
}
</style>
</head>
<body>
<div class="box effect">
<h3>Shadow Effect </h3>
</div>
</body>
</html>

 

效果如下：

 

选择器！！！重点！！！

其中：target是一个目标，表示被选中。在案例中，<a>标签的href值为#bg1、#bg2等，当点击下面的小图标的时候，就会跳到锚点处，那么触发了target事件，就有了动画。

  <!DOCTYPE HTML>
  <html lang="en-US">
  <head>
  <meta charset="UTF-8">
  <title>CSS3 Full Background Slider </title>
  <style type="text/css">
  @import url("http://www.w3cplus.com/demo/css3/base.css");
  @import url("http://fonts.googleapis.com/css?family=Yesteryear");
  html,body {
  height: 100%;
  }
  img.bg {
  min-height: 100%;
  min-width: 1024px;
  width: 100%;
  height: auto !important;
  height: 100%;
  position: fixed;
  top: 0;
  left: 50%;
  z-index:1;
  -webkit-transform: translateX(-50%);
  -moz-transform: translateX(-50%);
  -o-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  }
  .slider {
  position: absolute;
  width: 100%;
  text-align: center;
  z-index: 9999;
  bottom: 100px;
  }
  .slider li {
  display: inline-block;
  width: 170px;
  height: 130px;
  margin-right: 15px;
  }
  .slider a {
  display: inline-block;
  width: 170px;
  padding-top: 70px;
  padding-bottom: 20px;
  position: relative;
  cursor: pointer;
  border: 2px solid #fff;
  border-radius: 5px;
  vertical-align: top;
  color: #fff;
  text-decoration: none;
  font-size: 22px;
  font-family: \'Yesteryear\', cursive;
  text-shadow: -1px -1px 1px rgba(0, 0, 0, 0.8),-2px -2px 1px rgba(0, 0, 0, 0.3),-3px -3px 1px rgba(0, 0, 0, 0.3);
  }
  .slider li:nth-of-type(1) a {
  background-color: #02646e;
  }
  .slider li:nth-of-type(2) a {
  background-color: #eb0837;
  }
  .slider li:nth-of-type(3) a {
  background-color: #67b374;
  }
  .slider li:nth-of-type(4) a {
  background-color: #e6674a;
  }
  .slider li:nth-of-type(5) a {
  background-color: #e61061;
  }
  .slider a::after {
  content:"";
  display: block;
  height: 120px;
  width: 120px;
  border: 5px solid #fff;
  border-radius: 50%;
  position: absolute;
  left: 50%;
  margin-left: -60px;
  z-index: 9999;
  top: -80px;
  }
  .slider li:nth-of-type(1) a::after {
  background: url(http://www.w3cplus.com/demo/css3/CSS3Fullbackground/sbg1.jpg) no-repeat center;
  }
  .slider li:nth-of-type(2) a::after {
  background: url(http://www.w3cplus.com/demo/css3/CSS3Fullbackground/sbg2.jpg) no-repeat center;
  }
  .slider li:nth-of-type(3) a::after {
  background: url(http://www.w3cplus.com/demo/css3/CSS3Fullbackground/sbg3.jpg) no-repeat center;
  }
  .slider li:nth-of-type(4) a::after {
  background: url(http://www.w3cplus.com/demo/css3/CSS3Fullbackground/sbg4.jpg) no-repeat center;
  }
  .slider li:nth-of-type(5) a::after {
  background: url(http://www.w3cplus.com/demo/css3/CSS3Fullbackground/sbg5.jpg) no-repeat center;
  }
  .slider a::before {
  content:"";
  display: block;
  height: 120px;
  width: 120px;
  border: 5px solid #fff;
  border-radius: 50%;
  position: absolute;
  left: 50%;
  margin-left: -60px;
  z-index: 99999;
  top: -80px;
  background: rgba(0,0,0,0.3);
  }
  .slider a:hover::before {
  opacity:0;
  }
  /* Slide Left */
   
  @-webkit-keyframes \'slideLeft\' {
  0% { left: -500px; }
  100% { left: 0; }
  }
  @-moz-keyframes \'slideLeft\' {
  0% { left: -500px; }
  100% { left: 0; }
  }
  @-o-keyframes \'slideLeft\' {
  0% { left: -500px; }
  100% { left: 0; }
  }
  @-ms-keyframes \'slideLeft\' {
  0% { left: -500px; }
  100% { left: 0; }
  }
  @keyframes \'slideLeft\' {
  0% { left: -500px; }
  100% { left: 0; }
  }
   
  .slideLeft:target {
  z-index: 100;
  -webkit-animation-name: slideLeft;
  -webkit-animation-duration: 1s;
  -webkit-animation-iteration-count: 1;
  -moz-animation-name: slideLeft;
  -moz-animation-duration: 1s;
  -moz-animation-iteration-count: 1;
  -ms-animation-name: slideLeft;
  -ms-animation-duration: 1s;
  -ms-animation-iteration-count: 1;
  -o-animation-name: slideLeft;
  -o-animation-duration: 1s;
  -o-animation-iteration-count: 1;
  animation-name: slideLeft;
  animation-duration: 1s;
  animation-iteration-count: 1;
  }
   
   
  /* Slide Bottom */
   
  @-webkit-keyframes \'slideBottom\' {
  0% { top: 350px; }
  100% { top: 0; }
  }
  @-moz-keyframes \'slideBottom\' {
  0% { top: 350px; }
  100% { top: 0; }
  }
  @-ms-keyframes \'slideBottom\' {
  0% { top: 350px; }
  100% { top: 0; }
  }
  @-o-keyframes \'slideBottom\' {
  0% { top: 350px; }
  100% { top: 0; }
  }
  @keyframes \'slideBottom\' {
  0% { top: 350px; }
  100% { top: 0; }
  }
   
  .slideBottom:target {
  z-index: 100;
   
  -webkit-animation-name: slideBottom;
  -webkit-animation-duration: 1s;
  -webkit-animation-iteration-count: 1;
  -moz-animation-name: slideBottom;
  -moz-animation-duration: 1s;
  -moz-animation-iteration-count: 1;
  -ms-animation-name: slideBottom;
  -ms-animation-duration: 1s;
  -ms-animation-iteration-count: 1;
  -o-animation-name: slideBottom;
  -o-animation-duration: 1s;
  -o-animation-iteration-count: 1;
  animation-name: slideBottom;
  animation-duration: 1s;
  animation-iteration-count: 1;
  }
   
  /* Zoom In */
   
  @-webkit-keyframes \'zoomIn\' {
  0% { -webkit-transform: scale(0.1); }
  100% { -webkit-transform: none; }
  }
  @-moz-keyframes \'zoomIn\' {
  0% { -moz-transform: scale(0.1); }
  100% { -moz-transform: none; }
  }
  @-ms-keyframes \'zoomIn\' {
  0% { -ms-transform: scale(0.1); }
  100% { -ms-transform: none; }
  }
  @-o-keyframes \'zoomIn\' {
  0% { -o-transform: scale(0.1); }
  100% { -o-transform: none; }
  }
  @keyframes \'zoomIn\' {
  0% { transform: scale(0.1); }
  100% { transform: none; }
  }
  .zoomIn:target {
  z-index: 100;
  -webkit-animation-name: zoomIn;
  -webkit-animation-duration: 1s;
  -webkit-animation-iteration-count: 1;
  -moz-animation-name: zoomIn;
  -moz-animation-duration: 1s;
  -moz-animation-iteration-count: 1;
  -ms-animation-name: zoomIn;
  -ms-animation-duration: 1s;
  -ms-animation-iteration-count: 1;
  -o-animation-name: zoomIn;
  -o-animation-duration: 1s;
  -o-animation-iteration-count: 1;
  animation-name: zoomIn;
  animation-duration: 1s;
  animation-iteration-count: 1;
  }
   
  /* Zoom Out */
   
  @-webkit-keyframes \'zoomOut\' {
  0% { -webkit-transform: scale(2); }
  100% { -webkit-transform: none; }
  }
  @-moz-keyframes \'zoomOut\' {
  0% { -moz-transform: scale(2); }
  100% { -moz-transform: none; }
  }
  @-ms-keyframes \'zoomOut\' {
  0% { -ms-transform: scale(2); }
  100% { -ms-transform: none; }
  }
  @-o-keyframes \'zoomOut\' {
  0% { -o-transform: scale(2); }
  100% { -o-transform: none; }
  }
  @keyframes \'zoomOut\' {
  0% { transform: scale(2); }
  100% { transform: none; }
  }
   
  .zoomOut:target {
  z-index: 100;
  -webkit-animation-name: zoomOut;
  -webkit-animation-duration: 1s;
  -webkit-animation-iteration-count: 1;
  -moz-animation-name: zoomOut;
  -moz-animation-duration: 1s;
  -moz-animation-iteration-count: 1;
  -ms-animation-name: zoomOut;
  -ms-animation-duration: 1s;
  -ms-animation-iteration-count: 1;
  -o-animation-name: zoomOut;
  -o-animation-duration: 1s;
  -o-animation-iteration-count: 1;
  animation-name: zoomOut;
  animation-duration: 1s;
  animation-iteration-count: 1;
  }
   
  /* Rotate */
   
  @-webkit-keyframes \'rotate\' {
  0% { -webkit-transform: rotate(-360deg) scale(0.1); }
  100% { -webkit-transform: none; }
  }
  @-moz-keyframes \'rotate\' {
  0% { -moz-transform: rotate(-360deg) scale(0.1); }
  100% { -moz-transform: none; }
  }
  @-ms-keyframes \'rotate\' {
  0% { -ms-transform: rotate(-360deg) scale(0.1); }
  100% { -ms-transform: none; }
  }
  @-o-keyframes \'rotate\' {
  0% { -o-transform: rotate(-360deg) scale(0.1); }
  100% { -o-transform: none; }
  }
  @keyframes \'rotate\' {
  0% { transform: rotate(-360deg) scale(0.1); }
  100% { transform: none; }
  }
   
  .rotate:target {
  z-index: 100;
  -webkit-animation-name: rotate;
  -webkit-animation-duration: 1s;
  -webkit-animation-iteration-count: 1;
  -moz-animation-name: rotate;
  -moz-animation-duration: 1s;
  -moz-animation-iteration-count: 1;
  -ms-animation-name: rotate;
  -ms-animation-duration: 1s;
  -ms-animation-iteration-count: 1;
  -o-animation-name: rotate;
  -o-animation-duration: 1s;
  -o-animation-iteration-count: 1;
  animation-name: rotate;
  animation-duration: 1s;
  animation-iteration-count: 1;
  }
   
  /* Not Target */
   
  @-webkit-keyframes \'notTarget\' {
  0% { z-index: 75; }
  100% { z-index: 75; }
  }
  @-moz-keyframes \'notTarget\' {
  0% { z-index: 75; }
  100% { z-index: 75; }
  }
  @-ms-keyframes \'notTarget\' {
  0% { z-index: 75; }
  100% { z-index: 75; }
  }
  @-o-keyframes \'notTarget\' {
  0% { z-index: 75; }
  100% { z-index: 75; }
  }
  @keyframes \'notTarget\' {
  0% { z-index: 75; }
  100% { z-index: 75; }
  }
   
  .bg:not(:target) {
  -webkit-animation-name: notTarget;
  -webkit-animation-duration: 1s;
  -webkit-animation-iteration-count: 1;
  -moz-animation-name: notTarget;
  -moz-animation-duration: 1s;
  -moz-animation-iteration-count: 1;
  -ms-animation-name: notTarget;
  -ms-animation-duration: 1s;
  -ms-animation-iteration-count: 1;
  -o-animation-name: notTarget;
  -o-animation-duration: 1s;
  -o-animation-iteration-count: 1;
  animation-name: notTarget;
  animation-duration: 1s;
  animation-iteration-count: 1;
  }
  </style>
  </head>
  <body>
  <div class="slider">
  <ul class="clearfix">
  <li><a href="#bg1">Hipster Fashion Haircut </a></li>
  <li><a href="#bg2">Cloud Computing Services &amp; Consulting</a></li>
  <li><a href="#bg3">My haire is sooo fantastic!</a></li>
  <li><a href="#bg4">Eat healthy &amp; excersice!</a></li>
  <li><a href="#bg5">Lips so kissable I could die ...</a></li>
  </ul>
  </div>
  <img src="http://www.w3cplus.com/demo/css3/CSS3Fullbackground/bg1.jpg" alt="" class="bgslideLeft" id="bg1" />
  <img src="http://www.w3cplus.com/demo/css3/CSS3Fullbackground/bg2.jpg" alt="" class="bgslideBottom" id="bg2" />
  <img src="http://www.w3cplus.com/demo/css3/CSS3Fullbackground/bg3.jpg" alt="" class="bgzoomIn" id="bg3" />
  <img src="http://www.w3cplus.com/demo/css3/CSS3Fullbackground/bg4.jpg" alt="" class="bgzoomOut" id="bg4" />
  <img src="http://www.w3cplus.com/demo/css3/CSS3Fullbackground/bg5.jpg" alt="" class="bg rotate" id="bg5" />
  </body>
  </html>
   

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