css3鼠标悬停div盒子实现阴影效果

div {
  -webkit-transition: all 0.3s ease;
  -moz-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;  
}
div:hover {
  transform: translateY(-4px);
  -webkit-transform: translateY(-4px);
  -moz-transform: translateY(-4px);
  box-shadow: 0 20px 32px -18px rgba(79,125,183,.3);
  -webkit-box-shadow: 0 20px 32px -18px rgba(79,125,183,.3);
  -moz-box-shadow: 0 20px 32px -18px rgba(79,125,183,.3);
  -webkit-transition: all 0.3s ease;
  -moz-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

具体参数介绍：

transition：位移时间和时间曲线

transform：位移距离和方向

box-shadow：阴影的颜色，方向，尺寸