img { 
  /* 图片居中 */
  clear: both;
  margin: 0 auto;
  display: block;

  /* 添加图片阴影 */
  box-shadow:0px 1px 4px rgba(0,0,0,0.5),0 0 40px rgba(0,0,0,0.1) inset;
  webkit-box-shadow:0px 1px 4px rgba(0,0,0,0.5),0 0 40px rgba(0,0,0,0.1) inset;
  moz-box-shadow:0px 1px 4px rgba(0,0,0,0.5),0 0 40px rgba(0,0,0,0.1) inset;
  o-box-shadow:0px 1px 4px rgba(0,0,0,0.5),0 0 40px rgba(0,0,0,0.1) inset;
}