div设置box-shadow效果
div {
border-top: none;
border: 1px solid #f5f5f5;
box-shadow: 3px 2px 5px 2px #e4e3e3;
border-bottom-left-radius: 7px;
border-bottom-right-radius: 7px;
color: #828282;
box-sizing: border-box;
padding: 20px 0;
}