效果：

HTML代码：

XML/HTML Code复制内容到剪贴板 <divclass="boxshadow"></div>

CSS代码：

CSS Code复制内容到剪贴板 .box{ width:300px; height:100px; background:#ccc; border-radius:10px; margin:10px; } .shadow{ position:relative; max-width:270px; box-shadow:0px1px4pxrgba(0,0,0,0.3),/*外阴影*/ 0px0px20pxrgba(0,0,0,0.1)inset;/*内阴影*/ } .shadow::before, .shadow::after{ content:""; position:absolute; z-index:-1; } .shadow::before, .shadow::after{ content:""; position:absolute; z-index:-1; bottombottom:15px; left:10px; width:50%; height:20%; } .shadow::before, .shadow::after{ content:""; position:absolute; z-index:-1; bottombottom:15px; left:10px; width:50%; height:20%; box-shadow:015px10pxrgba(0,0,0,0.7); transform:rotate(-3deg); } .shadow::after{ rightright:10px; left:auto; transform:rotate(3deg); }

伪元素before和after意思是在被选元素的内容前或后 插入内容