css边框阴影问题

• 阴影落在下方：box-shadow: 0 3px 5px rgba(0, 0, 0, .2);
• 阴影落在四周：box-shadow: 0 3px 5px rgba(0, 0, 0, .2), 0 0 5px rgba(0, 0, 0, .2), 0 0 5px rgba(0, 0, 0, .2);
• 阴影落在左内侧：box-shadow:2px 0 2px rgba(0, 0, 0, .1) inset, 2px 0 0 rgba(0, 0, 0, .1)
• 阴影并且边框向上2px：-webkit-box-shadow: 0 15px 30px rgba(0,0,0,0.1);
• 阴影在上边内侧： box-shadow:0 3px rgba(0, 0, 0, .1) inset

• box-shadow: 0 15px 30px rgba(0,0,0,0.1);
  -webkit-transform: translate3d(0, -2px, 0);
  transform: translate3d(0, -2px, 0);
  
  
• 起落设置时间：

.animation {
transition: all .2s ease-in 0s;
}

.animation:hover {
-webkit-box-shadow: 0 15px 30px rgba(0,0,0,0.2),0 15px 30px rgba(0,0,0,0.2),0 0 15px rgba(0,0,0,0.2);
box-shadow: 0 15px 30px rgba(0,0,0,0.2),0 15px 30px rgba(0,0,0,0.2),0 0 15px rgba(0,0,0,0.2);
-webkit-transform: translate3d(0, -2px, 0);
transform: translate3d(0, -2px, 0);
}